1.3-3 Determine whether each of the following statements is true or false. If the statement is false, demonstrate this by proof or example. (a) Every continuous-time signal is an analog signal. (b) Everydiscrete-. (c) If a signal is not an energy signal, then it must be a power signal and vice versa. (d) An energy signal must be of finite duration. (e) A power signal cannot be causal. (f) A periodic signal cannot be anticausal.