Write a Verilog module that describes 8-bit right shifter register with control signals A(arithmetic), L(logical), CLR(clear) and LD(load). Input signals are CLK, LD and 8-bit input D. Output signal is 8-bit output Q. CLR signal will clear Q. LD signal will load input D to Q. A signal will do arithmetic right shift of Q, while L signal will do logical right shift of Q.