ex 4 & 5 . and why? please explain

Exercise 4 1 3 y. 2 Y RY . 5 4 6 6 This diagram depicts a finite state machine. What are units 2, 5, and 6? a. 2. Input: 5. Next state; 6. Registers. b. 2. Sequential logic: 5. Registers; 6. Control. c. 2. Combinational logic: 5. Present state; 6. Delay elements. d. 2. Memory: 5. Previous state; 6. Registers. Exercise 5 Consider a CPU that has a single ALU that can only XOR two operands. If you may only perform two operations on any number, which number representation can be inverted by this ALU? a. Numbers in 1C. b. Numbers in IC and 2C. c. Numbers in IC and SM. d. Numbers in IC, 2C, and SM