Is a Curves adjustment layer destructive or nondestructive?

Before loading a static array:

a. You must initialize each element to zero. b. You do not need to initialize the elements. c. You must define the array by telling the computer the number of needed elements. This may be done as the program is being executed. d. b and c. e. a and c.

Create a Web page named alert.html that contains a button. When clicked, the button should pop up an alert window that displays some message. The content of the message is entirely up to you.

What will be an ideal response?