What is the output of the following Python code ?
a = (1, 2) b = a b += (3,) c = [1, 2] d = c d += [3,] print(a, c)
(1, 2) [1, 2]
(1, 2, 3) [1, 2]
(1, 2) [1, 2, 3]
(1, 2, 3) [1, 2, 3]