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What is the usage of the keyword ? in R?

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What is the usage of the keyword ? in R?

(a) Help window

(b) Extensive search

(c) Error correction

(d) Error detection

I had been asked this question during an internship interview.

I need to ask this question from Getting Started with R in portion Sockets of JavaScript

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Correct option is (a) Help window

For explanation: ? is generally used to open the help window at any time. The help() function and ? help operator in R provides access to the documentation pages for R functions, data sets, and other objects, both for packages in the standard R distribution and for contributed packages.

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