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

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

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The correct choice is (d) is.nan() For explanation I would say: is.nan() is used to test if they are NaN. We can check NAN‘s at any stage of the code. We will remove the NA’s for the operations in R. is.nan() is used to test for NaN.

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