Give a REGULAR EXPRESSION for each of the following languages.
(a) L2a = {we{0,1}* | w corresponding to the binary encoding of non-negative integers that are evenly divisible by 4. No
leading zeros are allowed.).
(b) L2b = {we{a,b}* | w contains at least one 'a' and exactly two b's).
(c) L2c = {we{0,1,2}* | w starts with a 2, ends with a 1, and contains an even number of 0's). For example, both
201100201 and 21 are in the language.