Final answer:
The expression is incorrect because it expects the [ZONE] field to hold two conflicting values at once, but a field can only have one value, so the correct operator to use is OR instead of AND.
Step-by-step explanation:
The expression [ZONE] = 'RESIDENTIAL' AND [ZONE] = 'COMMERCIAL' is incorrect because it contains a logical contradiction. A single field within a database query cannot simultaneously equal two different values. This type of expression would always evaluate as false, as the [ZONE] field cannot be both 'RESIDENTIAL' and 'COMMERCIAL' at the same time. It's important to use OR instead of AND if you want to find records where the zone is either 'RESIDENTIAL' or 'COMMERCIAL'. The correct query expression should be [ZONE] = 'RESIDENTIAL' OR [ZONE] = 'COMMERCIAL'.