You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queri

A、SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_credit_limit？DESC

B、SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_credit_limit

C、SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_credit_limit？NULLS？LAST

D、SELECT？cust_last_name,？cust_credit_limit？FROM？customers？ORDER？BY？cust_last_name,？cust_credit_limit？NULLSLAST

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