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.