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Which of the following return a subset of the columns of a data frame?

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Which of the following return a subset of the columns of a data frame?

(a) select

(b) retrieve

(c) get

(d) set

This question was addressed to me in quiz.

My question is based upon dplyr in portion R – Data Storage, Formats, Objects and Operations of R Programming

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The correct option is (a) select

The explanation: One important contribution of the dplyr package is that it provides a “grammar” for data manipulation and for operating on data frames.

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