Let h(t) be the response of a linear system to a unit impulse δ(t). Consider the following statements in this regard—
(i) If the system is causal, h(t) = 0 for t < 0.
(ii) If the system is time-variable, then the response of the system to an input of δ(t – T) is h(t – T) for all values of the constant T.
(iii) If the system is non-dynamic then h(t) is of the form Aδ(t), where the constant A depends on the system of these the correct statements.