Regular expression

Question

What is the regular expression for sigma = {0,1} where each string has odd 0's.

 

Which one is correct?

A) 1*0(1*01*01*)*

B)  1*01*(1*01*01*)*

Comments

(B)is correct because from (A) we can't generate string 1011.The string 1011 has an odd number of 0's. we can generate it from (B) but not from (A).

Answer 1

B is correct because we cant generate any string 1011 from A , but we can make it from B