Question: Consider the regular expression (a + b) a(a + b). Which of the following best describes the set of strings generated by this regular expression?

Consider the regular expression (a + b) a(a + b). Which of the following best describes the set of strings generated by this regular expression?

(a) all strings over {a, b}

(b) all strings over {a, b} with an odd number of a s.

(c) all strings over {a, b} with an even number of a s.

(d) all strings over {a, b} in which the next to last symobol is an a.

(e) none of the above.

Please explain in great detail how to get answer.

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