When tracking patrons, the best approach for a busy server is to:

Explanation

Effective monitoring relies on systems, not memory alone. Many POS systems allow servers to flag drinks per guest, and a brief SCAN observation each time you visit the table catches changes early. Verbal handoffs at shift change (and noting heavy drinkers on a clipboard near the well) protect against the patron trick of waiting for a new server who has no observational baseline. Pure memory (a) fails on busy nights, blindly trusting co-workers (d) creates gaps, and reactive observation (b) means harm has already occurred before you act.