You want to set the following Initialization parameters for your database Instance   LOG_ARCHIVE_DEBT_1 = ，，LOCATION=/disk1/arch LOG_ARCHIVE_DBST_2 = ，，LOCATION=/disk2/arch LOC_ARCHIVB DBST_3 = ，，LOCATION=/disk3/arch LOG_ARCHIVE DBST_ = ，，LOCATION=/disk3/arch   Identify the statement that correctly describes this setting.（）  

• A、 The MANDATORY location must be a flash recovery area.
• B、 The optional destinations may not use the flash recovery area.
• C、 This setting is not allowed because the first destination is not set as MANDATORY.
• D、 The online redo log file is not allowed to be overwritten if the archived log cannot be created in the fourth destination.