What is the use of an index?

(a) Retrieve data more quickly and efficiently

(b) Related data requires much less I/O overhead if accessed simultaneously

(c) Simplify the user’s perception of data access

(d) All of the Mentioned

I got this question in unit test.

This intriguing question comes from Oracle Database 11g Architecture topic in chapter Oracle Database 11g Architecture Options of Oracle

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  (B) 5 and 12
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  (D) 12 and 20
  
  

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  (B) non-key and non-ordering
  (C) key and ordering
  (D) key and non-ordering
  
  

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