Which polynomial function has zeros -2, 1/2, 2, 1?

A. y = 2x^4 - 3x^3 - 7x^2 + 12x - 4
B. y = 2x^3 - 3x^2 - 7x + 12
C. y = 3x^3 - 7x^2 + 12x - 4
D. y = 3x^4 - 7x^2 + 12x - 4