How are discrete unit impulse functions and discrete time unit step fu

1.	How are discrete unit impulse functions and discrete time unit step functions related?
A.	They are inverse of each other
B.	(n)=u(n)-u(n-1)
C.	(n)=u(n)*2
D.	Integration of unit step function gives unit step function.
Answer» C. (n)=u(n)*2

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