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What is the function to set row names for a data frame?

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What is the function to set row names for a data frame? (a) row.names() (b) colnames() (c) col.names() (d) column name cannot be set for a data frame I had been asked this question in final exam. My question is from Basics topic in section History, Overview and Getting Started of R Programming Select the correct answer from above options

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The correct choice is (a) row.names() Explanation: row.names() is the function to set row names for a data frame. Data frames have a special attribute called row.names, which indicate information about each row of the data frame.

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