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Which of the following lists names of variables in a data.frame?

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Which of the following lists names of variables in a data.frame?

(a) quantile()

(b) names()

(c) barchart()

(d) par()

This question was addressed to me in an interview for job.

I need to ask this question from Visualizing Data topic in division Commands, Packages, Visualizing Data and Linear Regression of R Programming

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Right option is (a) quantile()

For explanation I would say: names function is used to associate name with the value in the vector.

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