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Given below is a list of functions and their purpose in random order.

Function Purpose
1)NVL a) Used for evaluating NOT NULL and NULL values
2)NULLIF b) Used to return the first non- null values in a list of expressions
3)COALESCE c) Used to compare two expressions. If both are same, it returns NULL; otherwise, it returns only the first expression.
4)NVL2 d) Used to convert NULL values to actual values Identify the correct combination of functions and their usage.

1-a, 2-c, 3-b, 4-d

1-d, 2-c, 3-b, 4-a

1-b, 2-c, 3-d, 4-a

1-d, 2-b, 3-c, 4-a

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