A binary variable Z is defined by the truth table shown. Which expression corresponds to the fundamental product for Z? a) Z = (A bar + B bar + C) middot (A + B bar + C) middot (A + B bar + C bar) middot (A bar + b bar + C) b) Z = (A + B + C) middot (A bar + B + C) middot (A bar + B + C bar) middot (A bar + B bar + C bar) c) Z = A bar B bar C bar + A B bar C bar + A B bar C + ABC d) Z = A bar B bar C + A bar B C bar + A bar BC + A B C bar a) b) C) d)