When should you create a role? （）

• A、To simplify the process of creating new users using the CREATE USER xxx IDENTIFIED by yyy statement.
• B、To grant a group of related privileges to a user.
• C、When the number of people using the database is very high.
• D、To simplify the process of granting and revoking privileges.
• E、To simplify profile maintenance for a user who is constantly traveling.