If x(t) X(Q), the nature of X(0) is : O a. Discrete & periodic O b. Continuous & periodic Oc Continuous & Non periodic O d. Discrete & Non periodic Which operation does x(t)=x(-1+t) exhibit? O a. Time scaling O b. Time shifting and folding O c. Time shifting O d. Time Folding The output of sampler is a. A discrete amplitude and a discrete time signal. O b. A continuous amplitude and discrete time signal. O c. A discrete amplitude and a continuous time signal. O d. A continuous amplitude and a continuous time signal