Q3. Using the three-bus organization, assume the following: (4 1 = 4 points) Having 4 general purpose registers. 4 special purpose registers. 6 ALU operations: Add, Subtract, Multiply, AND, OR, and Shift O 1. Design the microinstruction format if using a horizontal approach. Purpose Number of bits Explanations ALU Source1 Source 2 Destination Total 2. Show the active control bits when having Instruction: Subtract R1, R2, R3 ALU Source 1 Source2 Destination 3. Design the microinstruction format if using a Vertical approach Purpose Number of bits Explanations ALU Source 1 Source 2 Destination Total 4. Show the active control bits when having Instruction: Add RO, R7, R5 ALU Source 1 Source2 Destination