The array_pop() function ____ from the end of the array.

When an argument is passed ________ the called method can access and modify the caller’s original data directly.

a) either by value or by reference b) by value c) using keyword out d) using keyword ref e) Either c or d.

The prompt in the accompanying figure should say "Enter your _____."

A. registration key B. activation key C. access key D. password