What is the standard form of the following equation:
y = 2x^2 - 10x + 6
A) y = 2(x - 2.5)^2 - 6.5
B) y = (x - 5)^2 - 12.5
C) y = 2(x + 6.25)^2 + 6
D) y = 2(x - 2.5)^2 + 6