Find the function f (t) in terms of unit step function in the graph s

1.	Find the function f (t) in terms of unit step function in the graph shown below.
A.	4t [u (t) – u (t + 5)]
B.	4t [u (t) + u (t + 5)]
C.	4t [u (t) – u (t – 5)]
D.	4t [u (t) + u (t – 5)]
Answer» D. 4t [u (t) + u (t – 5)]

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