Which of the following statements is correct? a. The catalog forms the heart of a database. It

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Which of the following statements is correct?

a. The catalog forms the heart of a database. It can be an integral part of the DBMS or a standalone component.

b. The catalog makes sure the database continues to be correct by, among other measures, specifying all integrity rules.

c. The catalog describes all metadata components that are defined in the metamodel.

d. All of the above are correct.

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