Which credit enables a beneficiary to obtain pre－shipment financing with impact on his facility （） Confirmed Irrevocable credit

USTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result （）A．SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_credit_limit？DESCB．SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_credit_limitC．SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_credit_limit？NULLS？LASTD．SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_last_name,？cust_credit_limit？NULLSLAST