Use modelsim to create a 4-bit register, using the d flip-flops from the previous homework. the register should only change its value on a positive clock edge. include an enable bit and make the register only change its’s value if the enable bit is high during the positive clock edge. create a test bench to test the correct operation of the register. include screenshots of your verilog code, and simulation waveforms.

i need a verilog code & test bench & waveform for 4-bit register.