A common bus system which is capable of transferring 2 bits at time with number of registers are 4 each register is of 2 bit? Draw circuit diagram for this and also define how many multiplexers are...

A common bus system which is capable of transferring 2 bits at time with number of registers are 4 each register is of 2 bit? Draw circuit diagram for this and also define how many multiplexers are required and what will be the size of multiplexer with truth table ?Also explain how to gather data from this bus back into register.