The vertex form of the equation of a parabola is y = 4(x - 2)2 - 1. What is the standard form of the equation?
A.y = 4x2 - 16x + 2
B.y = 4x2 - 16x + 15
C.y = 4x2 - 3
D.y = 16x2 - 5 ?