Let F(t) =

Multiple Choice

Let F(t) = .Express F(t) in terms of the Heaviside function H(t -a

A) F(t) = 9 + 11 H(t - 4) - H(t - 7)
B) F(t) = 9 + 7 H(t - 4) + 5 H(t - 7)
C) F(t) = 9 + 2 H(t + 4) - 3 H(t + 7)
D) F(t) = 9 + 2 H(t - 4) - 3 H(t - 7)
E) F(t) = 9 - 7 H(t - 4) - 5 H(t - 7)