题目5单选题
下图所示为一个不确定有限自动机(NFA)的状态装换图.该NFA识别的字符串集合可用正规式( )描述. <img src="https://tihai-oss-cloud.itihey.com/img/99903b1f1b88dfb7298345df77e5efd1.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/e73b7d9e1cf6e09b2b7bd8785ec42a45.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/0d6a895b3edbe4d19cd3bbb38b6fa80d.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/496f40037cfc316c3a32e294868e0b6a.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/f5943943ef8c5c034bd5ed17bd0e70b9.png">