以下各标识符中，合法的用户标识符组为   

A、<span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">PAd</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">P#d</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">b-b</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">abc</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">_0123</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">ssiped</span>

B、<span style="font-size: 16px; line-height: 18.88888931274414px;"><span style="font-size: 9px; line-height: normal; font-family: &#39;Times New Roman&#39;;">&nbsp;</span></span><span style="font-size: 16px; line-height: 18.88888931274414px;">cin</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">，</span><span style="font-size: 16px; line-height: 18.88888931274414px;">a10</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">，</span><span style="font-size: 16px; line-height: 18.88888931274414px;">CPP</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">，</span><span style="font-size: 16px; line-height: 18.88888931274414px;">float</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">，</span><span style="font-size: 16px; line-height: 18.88888931274414px;">del_word</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">，</span><span style="font-size: 16px; line-height: 18.88888931274414px;">signed</span>

C、<span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">void</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">max</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">hiy</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;"></span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">list</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">*jer</span>

D、<span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">a</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">temp</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">_isw</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">INT</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">keep</span><span style="font-size:16px;font-family:宋体">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">wind</span>