How does a relational database ensure data integrity?

Correct option is B

Data integrity in relational databases is upheld through schema constraints, which include primary keys, foreign keys, and other validation rules that enforce accurate and reliable data entry.
Information Booster:
· Schema Constraints: Ensure that data complies with set rules, preventing anomalies.
· Foreign Key Constraints: Ensure referential integrity across tables.
Additional Knowledge:
· Encryption secures data but does not enforce integrity rules.
· Compression is for storage efficiency, unrelated to integrity.
· Unrestricted Access is contrary to controlled data integrity.