1. Consider the expression (A 1) (A2)(A B)(A B C)(A B C 1)(AB C- 1)(D E)/(A- B)(A B-C)) Assuming a simple three-operand format with instructions ADD, SUB, MULT and DIV (and that all data is in registers), write the assembly language code to implement this minimum data dependency (assuming that der instruction only). 2. Explain the function of the following registers in a CPU: PC, MAR, MBR, IR 3. How does a computer "know" whether an operand in its instruction register is a literal or a reference to memory (i.e., an address)? 4. Does a computer need Data Register? 5. Draw a diagram showing the flow of data inside a computer to/from the CPU, Main Memory, Different buses, Registers and ALU