4. (10 points) Consider the following regular expressions: A. (00 U 01 U10 U11)* B. ((1*)0(1*)0)*((1*)0(1*)) C. (00 U 01 U10 U11)*(00 U 01 U10 U11) D. ((1*)0(1*)0)*(1*) 1 Let them be named A,B,C,D from left to right. For which of these expres- sions E is L(E) exactly the following sets of strings? The regular expression should represent exactly these strings and no others. There may not be any correct answers for some of the questions. After each part (5.1, 5.2, 5.3, 5.4, 5.5, 5.6) write the name (letter) of the expression that represents the given set of strings, or write none" if none of the expressions fits the description. 4.1) Strings having an odd number of zeroes. 4.2) Strings having an even number of zeroes. 4.3) Strings having an odd number of ones. 4.4) Strings having an even number of ones. 4.5) Strings of odd length. 4.6) Strings of even length