单选题View the Exhibit and examine the Flashback Database architecture. Identify the missing component （shown with a "？"） in the Flashback Database architecture.（）A DBWnB RVWRC ARCHD RECOE TRWR
单选题
View the Exhibit and examine the Flashback Database architecture. Identify the missing component （shown with a "？"） in the Flashback Database architecture.（）
A
DBWn
B
RVWR
C
ARCH
D
RECO
E
TRWR
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