How do you define a function in R?

Using the function keyword followed by the function name, input parameters, and the function body
Using the def keyword followed by the function name, input parameters, and the function body
Using the func keyword followed by the function name, input parameters, and the function body
Using the define keyword followed by the function name, input parameters, and the function body

In R, a function is defined using the function keyword, followed by the function name, input parameters (if any), and the function body enclosed in curly braces {}. The function body contains the code that defines the operations to be performed by the function.

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