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Which two statements are true about Oracle databases and SQL?

Which two statements are true about Oracle databases and SQL?

A.

Updates performed by a database user can be rolled back by another user by using the ROLLBACK command.

B.

The database guarantees read consistency at select level on user-created tablers.

C.

When you execute an UPDATE statement, the database instance locks each updated row.

D.

A query can access only tables within the same schema.

E.

A user can be the owner of multiple schemas In the same database.

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