Which of the following code extracts 1st element of the 2nd element?

> x <- list(a = list(10, 12, 14), b = c(3.14, 2.81))

A. List B. Matrix C. Data Frame D. Vector

A. A list of elements B. A one-dimensional array C. A two-dimensional array D. A data frame

A. my_list <- c(1, "hello", TRUE) B. my_list = list(1, "hello", TRUE) C. my_list(1, "hello", TRUE) D. list(my_list = c(1, "hello", TRUE))

A. List B. Matrix C. Data Frame D. Array