YouneedtogeneratealistofallcustomerlastnameswiththeircreditlimitsfromtheCUSTOMERStable.Thosecustomerswhodonothaveacreditlimitshouldappearlastinthelist.Whichtwoquerieswouldachievetherequiredresult?()

A.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_credit_limitDESC

B.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_credit_limit

C.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_credit_limitNULLSLAST

D.SELECTcust_last_name,cust_credit_limitFROMcustomersORDERBYcust_last_name,cust_credit_limitNULLSLAST