Which statement about application-period temporal tables is true?
A. Consists of explicitly-supplied timestamps and a separate associated history table.
B. Is based on explicitly-supplied timestamps that define the time periods during which data is valid.
C. Is useful when one wants to keep both user-based period information and system-based historical information.
D. Consists of a pair of columns with database-manager maintained values that indicate the period when a row is current.
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