_____ is a set of Access rules that governs data entry and helps ensure data accuracy.

A) A one-to-many relationship
B) A common field
C) Referential integrity
D) Data redundancy

Referential integrity is a set of rules in Access that ensures that relationships between tables are valid and that data in related tables is accurate. It helps prevent data entry errors and inconsistencies in the database. A one-to-many relationship refers to the type of relationship between tables in which one record in the first table can relate to many records in the second table, but each record in the second table can only relate to one record in the first table. A common field is a field that appears in multiple tables and is used to create relationships between the tables. Data redundancy refers to the duplication of data in a database, which can lead to errors and inconsistencies. While each of these concepts is important in database design, referential integrity specifically relates to data entry and accuracy rules.