The signal defined by the equations f(t) = 0 for t a is

a shifted step function originating at t = a

The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0

1.	The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ≤ t ≤ a and f(t) = 0 for t > a is
A.	a step function
B.	a pulse function
C.	a shifted step function originating at t = a
D.	none of the above
Answer» C. a shifted step function originating at t = a