信用证规定到期日为2001年5月31日，而未规定最迟装运期，则可理解为（       ）。

<span style、"font-family: 宋体;">该信用证无效</span>

<span style、"font-family: 宋体;">最迟装运期为</span>2001<span style="font-family: 宋体;">年</span><span style="font-family: Calibri;">5</span><span style="font-family: 宋体;">月</span><span style="font-family: Calibri;">10</span><span style="font-family: 宋体;">日</span>

<span style、"font-family: 宋体;">最迟装运期为</span>2001<span style="font-family: 宋体;">年</span><span style="font-family: Calibri;">5</span><span style="font-family: 宋体;">月</span><span style="font-family: Calibri;">16</span><span style="font-family: 宋体;">日</span>

<span style、"font-family: 宋体;">最迟装运期为</span>2001<span style="font-family: 宋体;">年</span><span style="font-family: Calibri;">5</span><span style="font-family: 宋体;">月</span><span style="font-family: Calibri;">31</span><span style="font-family: 宋体;">日</span>