Which three attributes of the LOG_ARCHIVE_DEST_n initialization parameter control the data availability mode of a Data Guard standby database？ （）

• A、SYNC or ASYNC to identify the network transmission mode. 
• B、LGWR or ARCH to identify the primary database process responsible for sending redo information to the standby. 
• C、AFFIRM or NOAFFIRM to control whether log archiving disk write operations are to be performed synchronously or asynchronously. 
• D、PROTECTED or UNPROTECTED to control the degree of divergence and data loss at the standby database.