________ can be modulated using amplitude, frequency, or phase modulation

In terms of online sales, in many cases, receiving which of the following is the first step in the buying process?

A) direct mail flyer B) e-mail C) catalog D) telemarketing call

"Giving a speech is like a fine meal: There's an appetizer (introduction), the main course (body), and a dessert (conclusion)." This is an example of what type of support material?

Indicate whether the statement is true or false.