For each one of the 3 frequency responses, H(f), in parts (a), (b), and (c) do the following:
i. Obtain the system's impulse response, h(t).
ii. Indicate if the system is BIBO stable or not, and state why.
iii. Indicate if the system is causal or not, and state why.
iv. Obtain the zero-state response to an input f(t) = u(t).
(a)H(f)= 1/1+j 3f
(b) H(f) = (-1+j6f )/(1+j 3f)
(c)H(f)=e^j2f/1+j 3f