A partial data path of a processor is given in the figure, where RA, RB, and RZ are 32-bit registers. Which option(s) is/are CORRECT related to arithmetic operations using the data path as shown?

From the given data path:

• $Mux_A$ has two inputs: the 32-bit register $\text{RA}$ and a 32-bit immediate value, controlled by the signal Select RA/immediate.

• $Mux_B$ has two inputs: the 32-bit register $\text{RB}$ and a 32-bit immediate value, controlled by the signal Select RB/immediate.

• Both inputs to the ALU are fed from the outputs of $Mux_A$ and $Mux_B$ respectively, and the result is stored in the 32-bit register $\text{RZ}$.

Since both multiplexers can be controlled independently:

1. Two registers: Selecting $\text{RA}$ through Mux_A and $\text{RB}$ through Mux_B feeds both registers into the ALU, allowing arithmetic operations involving two registers. Hence, (A) is correct.

2. One register and one immediate value: Selecting $\text{RA}$ and the immediate value (or $\text{RB}$ and the immediate value) allows arithmetic operations involving one register and one immediate value. Hence, (B) is correct.

3. Two immediate values: Selecting the immediate value from both Mux_A and Mux_B allows arithmetic operations involving two immediate values. Hence, (C) is correct.

4. (D) is incorrect because the datapath is not restricted to *only* one register and one immediate value.

Thus, the correct options are A, B, and C.