Using the parent function y = x^2 match the transformation with the correct equation.

Shift 4 units up
Shift 4 units down
Shift 4 units to the right
Shift 4 units to the left

Answer choices:
Y = (x + 4)^2
Y = x^2 - 4
Y = x^2 + 4
Y = (x - 4)^2

Shift 4 units up: Y = x^2 + 4

Shift 4 units down: Y = x^2 - 4
Shift 4 units to the right: Y = (x - 4)^2
Shift 4 units to the left: Y = (x + 4)^2