下列合法的标识符为  

A、<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;">abde+</span>

B、<span style="line-height: 18.88888931274414px;">#KDJF</span>

C、<span style="line-height: 18.88888931274414px;">67KDJ</span>

D、<span style="line-height: 18.88888931274414px;">DK3_</span>