Consider the following identities for regular expressions: (a) (r + s)* = (s + r)* (b) (r*)* = r* (c) (r* s*)* = (r + s)* Which of the above identities are true?

Consider the following identities for regular expressions: (a) (r + s)

1.	Consider the following identities for regular expressions: (a) (r + s)* = (s + r)* (b) (r) = r* (c) (r* s) = (r + s)* Which of the above identities are true?
A.	(a) and (b) only
B.	(b) and (c) only
C.	(c) and (a) only
D.	(a), (b) and (c)
Answer» E.

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Consider the following identities for regular expressions: (a) (r + s)* = (s + r)* (b) (r*)* = r* (c) (r* s*)* = (r + s)* Which of the above identities are true?

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Consider the following identities for regular expressions: (a) (r + s)* = (s + r)* (b) (r) = r* (c) (r* s) = (r + s)* Which of the above identities are true?