Which two steps check out a database connection from the connection pool?（）

A.to release memory held by the prompt variable  
B.to clear the value of the menu choice before the prompt is played  
C.to prevent the previous value from being used again on the menu choice  
D.to prevent the caller from entering a menu choice before the prompt has played

A.Set  
B.Call Subflow  
C.On Exception Goto  
D.Get Reporting Statistic