A disadvantage of Java is the large memory requirements to store a separate copy of each variable and method for each instantiation of a class.

For a single home user who regularly surfs the Web, exchanges e-mail, and uses instant messaging, a firewall's primary job is to keep viruses from infecting files and prevent Trojan horses from entering the system through hidden openings called ____________________.

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

Which of the following formats is most likely to be the format for the final working files included with final output files?

a. JPEG b. TIFF c. PSD d. PDF