What will be the output of the following R code?

> x <- data.frame(foo = 1:4, bar = c(T, T, F, F))
> ncol(x)

What symbol is used for assignment in R?

A. <-

B. =

C. ->

D. assign()

What does the function print() do in R?

A. Display the result of a calculation

B. Read input from the user

C. Plot a graph

D. Install a package

In R, how is a variable assigned a value?

A. set

B. =

C. ->

D. assign()

What is the purpose of the seq() function in R?

A. Create a sequence of numbers

B. Sort a vector

C. Merge two data frames

D. Compute the mean of a numeric vector