下图所示为一个不确定有限自动机（NFA）的状态转换图。该NFA识别的字符串集合可用正规式（ ）描述。
- A.ab*a
- B.（ab）*a
- C.a*ba
- D.a（ba）*
正确答案及解析
正确答案
解析
根据图中展示，其正规式应以a开头，a结尾，b可以出现0次或多次，所以是ab*a，基本上可以排除BCD三项，答案为A。
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