For each of these functions f decide whether f is equal to the identity on A. When in doubt, make a table for the values of the function at all elements of the domain. select select select select 1. A Zs. f coc where c: A A. c(x) = (-) mod 5 2. A Z. f coc where c: A A. c(x) = (x + 1) mod 5 = 3. A = Z5 Z5, f = coc where c: A A. c((a, b)) = (b, a) 4. A Z2. f AA. f(x) = x mod 2 =