For the circuit of Fig. 6.14 , give three alternatives for a mod-10 counter (i.e., the c...

For the circuit of Fig. 6.14 , give three alternatives for a mod-10 counter (i.e., the count evolves through a sequence of 12 distinct states).

(a) Using an AND gate and the load input.

(b) Using the output carry.

(c) Using a NAND gate and the asynchronous clear input.