Explanation:

Here is the explanation of all options:

- Option 1: to restore such benefit

- If a contract becomes void, any benefit received under such a contract should be returned to the person who originally provided it.

- Option 2: to make compensation for such benefit

- Alternatively, the person who received the benefit could compensate for it instead of returning it in its original form. This often applies when restoration isn't possible.

- Option 3: either (a) or (b)

- The receiving party may choose to either return the benefit or compensate for it, depending on the circumstances.

- Option 4: neither (a) nor (b)

- This suggests that no action is required, which is incorrect when a contract is voided.

Correct Answer: Option 3 - either (a) or (b)

- One must either restore the benefit or compensate for it.