1-Design a 4-bit ripple up counter using positive edge trigger J-K flip-flops.

1-Design a 4-bit ripple up counter using positive edge trigger J-K flip-flops.
2- Design a 4-bit shift left register using D flip-flops.
3- Design a 3-bit shift right register using D flip-flops.
4- Draw a 4-bit shift right register using D flip flops. Show the contents of the register after three times shift right with serial input (101). Assume the register initially contains (1100)