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

What is the function used to test objects (returns a logical operator)

1.	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
Answer» 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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