Consider the following expressions :
(a) Y = f(A, B, C, D) = Σ (1, 2, 4, 7, 8, 11, 13, 14)
(b) Y = f(A, B, C, D) = Σ (3, 5, 7, 10, 11, 12, 13, 14)
(c) Y = f(A, B, C, D) = Π (0, 3, 5, 6, 9, 10, 12, 15)
(d) Y = f(A, B, C, D) = Π (0, 1, 2, 4, 5, 8, 9, 15)
Which of the above expressions are equivalent to the expression Y = A⊕B⊕C⊕D ?