Which of the following regular expressions describes the set of binary strings that consists of an even number of O's and an odd number of 1 's?
(00\cup 1(11)^(*))^(*)
((00)^(*)1(11)^(*))^(*)
(00^(*)\cup 1(11)^(*))^(*)
((1\cup 00)^(*)\cup (11))^(*)
None of the above