Q. What will be the output of the following R code?
> x <- list(a = 1:4, b = rnorm(10), c = rnorm(20, 1), d = rnorm(100, 5))
> sapply(x, mean)

• (A) a b c d 2.500000 -0.251483 1.481246 4.968715
• (B) a b c d 2.500000 -3.251483 2.481246 5.968715
• (C) a b c d 3.500000 0.251483 1.481246 4.968715
• (D) Error