The vertex form of the equation of a parabola is y = (x + 3)2 + 53. 
What is the standard form of the equation?
 
A.y = x2 + 53x + 42
 
B.y = x2 + 6x + 62
 
C.y = x2 + 3x + 53
 
D.y = 6x2 + 9x+ 62