Consider the following register transfer statements for two 4-bit registers R1 and R2. 

xT:  R1←R1 + R2 

x'T: R1←R2

Every time that variable T = 1, either the content of R2 is added to the content of R1 if x = 1, or the content of R2 is transferred to R1 if x = 0. Draw a diagram showing the hardware implementation of the two statements. Use block diagrams for the two 4-bit registers, a 4-bit adder, and a quadruple 2-to-1-line multiplexer that selects the inputs to R1. In the diagram, show how the control variables x and T select the inputs of the multiplexer and the load input of register R1.