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In a relational database, what is the purpose of a primary key and a foreign key? a . Primary key is a unique identifier for

In a relational database, what is the purpose of a primary key and a foreign key?
a.
Primary key is a unique identifier for a table, while a foreign key is used to store redundant information for backup purposes.
b.
Primary key is used is used for sorting records in ascending order, while a foreign key is used for sorting records in descending order.
c.
Primary key is used for sorting records in descending order, while a foreign key is used for sorting records in ascending order.
d.
Primary key is used to encrypt sensitive data, while a foreign key is used to decrypt data during retrieval.
e.
Primary key ensures data integrity by preventing duplicate values in a table, while a foreign key defines relationships between tables.

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