To add a field (or column) to an existing table in a database, the ALTER TABLE command is used. INSERT adds rows, UPDATE modifies data, and DELETE removes rows.

Here are the answers to the multiple-choice questions:

33. To add a field (or column) to an existing table in a database, the ALTER TABLE command is used. INSERT adds rows, UPDATE modifies data, and DELETE removes rows. The correct answer is C.

34. A Foreign key field can accept null values in one table (if it's optional) while needing to refer to a unique (primary or candidate) key in another table. The correct answer is B.

35. An Array is a data type that best holds elements of the same data type grouped together and treated as a whole. A record holds elements of potentially different data types. The correct answer