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What is the purpose of the index in sql server?

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What is the purpose of the index in sql server?

(a) To enhance the query performance

(b) To provide an index to a record

(c) To perform fast searches

(d) All of the mentioned

I had been asked this question by my college professor while I was bunking the class.

Asked question is from Index Definition in SQL topic in chapter Indexing and Hashing of Database Management

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The correct answer is (d) All of the mentioned

The best explanation: A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes.

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