Each pass through a loop is called a(n) ____________________.

Since filtering needs to be done as close to the source as possible by routers or gateways knowing the valid address ranges of incoming packets, an _______ is best placed to ensure that valid source addresses are used in all packets from its customers.

Fill in the blank(s) with the appropriate word(s).

Identify the letter of the choice that best matches the phrase or definition.

A. Makes blend pixels transparent B. Allows you to move the handles on the transform bounding box independently C. A blanket of high-contrast pixels that produce a grainy effect over an image D. The color of the original pixel E. Areas in an image where highly contrasting pixels meet