Answer:
a product control list should be used when a product is being tested, discarded, used, or prepared.
Explanation:
1. Tested: When the quality, safety, or compliance of the product needs to be assessed through testing procedures.
2. Discarded: When a decision is made to dispose of or get rid of the product due to expiration, damage, or other reasons.
3. Used: When the product is consumed, utilized, or incorporated into a process.
4. Prepared: When the product is being processed, assembled, or made ready for its intended use or purpose.
