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What is the function used to test objects (returns a logical operator) if they are NA?

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What is the function used to test objects (returns a logical operator) if they are NA? (a) is.na() (b) is.nan() (c) as.na() (d) as.nan() I had been asked this question during an online exam. The above asked question is from Overview of R topic in chapter History, Overview and Getting Started of R Programming Select the correct answer from above options

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The correct option is (a) is.na() The explanation: is.na() is the function used to test if they are NA. We can check NA ‘s at any stage of the code. Generally, We will remove the NA’s for the operations in R like mean etc.., is.na() is used to test objects if they are NA.

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