A rocket is launched from the ground. The function h (t) = - 4.9t^2 + 180t models the height of a rocket launcher from the ground t seconds after it is launched. If all other factors remain the same, which of the following function models the height of a rocket above the ground after t seconds if it is launched from a platform 100 feet in the air?

(1) h (t) = - 4.9t^2 + 280t

(2) h (t) = - 4.9t^2 + 180t - 100

(3) h (t) = - 4.9t^2 + 180t + 100

(4) h (t) = - 4.9t^2 + 180 (t+100)