單項(xiàng)選擇題

What type of protection is implemented when the DBA issues the ALTER DATABASE SET STANDBY DATABASE PROTECTED; command?()

A.The standby database is protected against write operations. 
B.The primary database is protected against write operations. 
C.The primary database is protected against data loss and data divergence. 
D.The standby database is protected against data loss and data divergence. 

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