Explanation:

- In contract law, "performance" refers to the completion of the duties assigned under a contract.

- Option 1: Actual Performance - This is when all parties fulfill their contractual obligations as agreed.

- Option 2: Attempted Performance - This occurs when a party tries to fulfill their obligations, but due to some reason, the performance is not complete.

- Option 3: Either (a) or (b) - This suggests that performance can be recognized as fulfilled either by actual or attempted actions.

- Option 4: Both (a) and (b) - This would imply that both must occur for the contract to be fulfilled, which is not usually feasible in typical contract situations.