How is the continuous time impulse function defined in terms of the st

1.	How is the continuous time impulse function defined in terms of the step function?
A.	u(t) = d(d(t))/dt
B.	u(t) = d(t)
C.	d(t) = du/dt
D.	d(t) = u<sup>2</sup>(t)
Answer» D. d(t) = u<sup>2</sup>(t)

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