What is the relation between the unit impulse function and the unit ramp function?

A)
d = d²(r)/dt²
B)
r = d²(r)/dt²
C)
d = dr/dt
D)
r = dd(t)/dt

Correct Answer : Option (A) :   d = d²(r)/dt²


Explanation : Now, d = du/dt and u = dr/dt. Hence, we obtain the above answer.