What constraint type does the following constraint belong to?"Every table must have a primary key, of which no part can be null."Select one:a.Entity integrityb.Domain integrityc.Semantic integrityd.Referential integrity

The constraint "Every table must have a primary key, of which no part can be null" belongs to the Entity integrity constraint type.

Here's why:

Entity integrity constraints ensure that each row (or record) in a table is unique and identifiable. This is typically enforced by designating a column (or set of columns) as the primary key. The primary key must have a unique value for each row, and it cannot contain null values. This ensures that no two rows are identical and each row can be uniquely identified by its primary key value.

So, the correct answer is a. Entity integrity.