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单选题
Exhibit， Viewing 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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（xxx） xxxxxxxC
（xxx） xxx-xxxxD
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10 MB D
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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
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Ipforwarding is not turned on
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129.35.57.22B
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Exhibit BC
The query returns no rowsD
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The query fails because both the inner and outer queries are retrieving data from the same table.
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