Which two queries execute successfully?

The CUSTOMERS table has a CUST_CREDIT_LIMIT column of data type NUMBER.
Which two queries execute successfully?
A. SELECT NVL (cust_credit_limit * .15, ‘Not Available’) FROM customers;
B. SELECT TO_CHAR(NVL(cust_credit_limit * .15, ‘Not Available’)) FROM customers;
C. SELECT NVL(TO_CHAR(cust_credit_limit * .15), ‘Not Available’) FROM customers;
D. SELECT NVL2(cust_credit_limit, TO_CHAR(cust_credit_limit * .15), ‘Not Available’) FROM customers;
E. SELECT NVL2 (cust_credit_limit * .15, ‘Not Available’) FROM customers;

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