Explanation:

The Arithmetic Logic Unit (ALU) of a computer performs the four fundamental arithmetic operations: **addition, subtraction, multiplication, and division**. While ALUs can have many specialized instructions, these are the core distinct types of arithmetic computations. * **Option A (4):** This is the correct answer, referring to addition, subtraction, multiplication, and division. * **Option B (2):** This is too few, as it would omit multiplication and division. * **Option C (5):** There isn't a commonly recognized fifth fundamental arithmetic operation in this context. * **Option D (8):** While an ALU might support more complex arithmetic instructions, the basic *types* are the four fundamental ones.