单选题View the Exhibit and examine the Flashback Database architecture. Identify the missing component （shown with a "？"） in the Flashback Database architecture.（）ADBWnBRVWRCARCHDRECOETRWR
题目
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