A synchronous counter with count sequence 0 - 1 - 3 - 4 - 5 - 7-0, is designed using D flip-flop. The inputs equations for the designed counter is Select one: a. None of the given options define the correct input equations b. D2 = xnor (Q2, Q1), D1 = Q1' QO, DO = Q1' QO + Q2 Q1' C. D2 = xor (Q2, Q1), D1 = Q1 QO, DO = Q1 QO + Q2 Q1 d. D2 = xor (Q2, Q1), D1 = Q1' QO, DO = Q1' QO + Q2 Q1