（多选题）
Which three attributes of the LOG_ARCHIVE_DEST_n initialization parameter control the data availability mode of a Data Guard standby database？ （）
ASYNC or ASYNC to identify the network transmission mode.
BLGWR or ARCH to identify the primary database process responsible for sending redo information to the standby.
CAFFIRM or NOAFFIRM to control whether log archiving disk write operations are to be performed synchronously or asynchronously.
DPROTECTED or UNPROTECTED to control the degree of divergence and data loss at the standby database.
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