Factor this polynomial expression.
x2 - 36
A(x + 36)(x - 36)
B(x - 6)(x - 6)
C(x - 36)(x - 36)
D(x + 6)(x - 6)
x2 - 36
A(x + 36)(x - 36)
B(x - 6)(x - 6)
C(x - 36)(x - 36)
D(x + 6)(x - 6)