Which option is NOT a valid syntax for deleting from a data store entity?

The option that is not a valid syntax for deleting from a data store entity is the one that specifies {deleteMe: pv!item}. This is because, in Appian, deleting data from a data store entity requires a specific structure that involves defining the entity to delete from and the identifiers for the items you wish to delete.

In contrast, valid syntaxes typically involve specifying the entity and its identifiers, like in the first two options, which include the necessary fields to effectively target items for deletion. The correct structures, such as using identifiers or data types, delineate the necessary components to identify which records within a data store should be removed.

Thus, the use of inappropriate keys or terms that do not conform to the expected structure results in the option with {deleteMe: pv!item} being invalid for deletion operations in Appian.