Which of the following classifications of viruses can change its own code to avoid detection?

What is one difference between using Alt keys instead of Control keys?

A) You can see the Alt letter combinations on your screen. B) Alt key commands work in all versions of Word while Control keys do not. C) Alt keys are more commonly used. D) There is more logic to Alt keys.

Measurable Web site performance standards are often called _________________________.

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