Q4) Design a Register File which includes four 2-bit registers (In total, it includes 8 bits). Each register is named as ala, b1b0, c2c0, d1d0. Registers are loaded from the Sinput. In addition to that, there are two input signals, X and Y, to determine which register to select (ie. 00 selectsfirst register alal etc). Also there is R signal. When W is zero, the content of the register does not change. When the W is 1 the selected register is loaded with a new value by shifting from the S input. Design this register file by using D flip-flops