单项选择题

AfteranumberofdayssetbytheparameterCONTROL_FILE_RECORD_……

After a number of days set by the parameter CONTROL_FILE_RECORD_KEEP_TIME， the information in the control file is overwritten by RMAN. What is this parameter’s default value？（）

A.1 day
B.5 days
C.7 days
D.31 days

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