单选题
AIt is the time period after which the undo data becomes obsolete.
BIt is the time period after which the committed undo data would be transferred to a temporary tablespace.
CIt is the minimum time period up to which the committed undo data would be retained if free undo space isavailable.
DIt is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
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