Explanation:

In a database, primary keys are used to uniquely identify records within a table. They ensure that each record has a unique identifier, which helps in organizing and managing data efficiently.

When primary keys are used to establish a relationship between two tables, the relationship between them can be categorized into different types based on the cardinality of the relationship. The cardinality refers to the number of occurrences of a particular entity in a relationship.

The given question states that records containing these primary keys are uniquely identified by these keys, and there is a relationship between them. We need to determine the type of relationship based on the given options.

Options:

a) 1:1 (One-to-One Relationship)
b) 1:M (One-to-Many Relationship)
c) M:1 (Many-to-One Relationship)
d) M:M (Many-to-Many Relationship)

Explanation of the Correct Answer:

The correct answer is option 'A' - 1:1 (One-to-One Relationship).

In a one-to-one relationship, each record in one table is associated with exactly one record in the other table. This means that for every record in one table, there is a unique corresponding record in the other table.

In the given question, the primary keys uniquely identify the records, indicating that each record in one table is associated with exactly one record in the other table. This is a characteristic of a one-to-one relationship.

For example, let's consider two tables - 'Employee' and 'Contact'. The primary key in the 'Employee' table is the employee ID, and the primary key in the 'Contact' table is the contact ID. Each employee can have only one contact, and each contact belongs to only one employee. This represents a one-to-one relationship between the 'Employee' and 'Contact' tables.

In conclusion, when records containing primary keys are uniquely identified by these keys and have a one-to-one relationship between them, it signifies option 'A' - 1:1 relationship.