Let f(x, y, z) = x y + z be a Boolean function on three Boolean variables, x, y and z. Then the domain and range of f are a. {0, 1} and {0, 1}. b. {0, 1}^3 and {0,1} c. {0, 1}^3 and {0, 1}^3 d. {0, 1} and {0, 1}^3