The operating system knows when input and output operations begin and end because these events are marked by __________.

Which of the following correctly declares and initializes a two-dimensional rectangular array of integers?

a) int[,] sum = new int[3, 4]; b) int[] sum = new int[2, 4]; c) int sum[] = new int[2, 2]; d) None of the above.

In the following line, the word writeln is a ________ which performs a task or action in the script.

``` document.writeln("Hello World"); ``` a) structure b) collection c) object d) method