Which technology uses telephone lines to carry digital signals?

Answer the following statements true (T) or false (F)

1. In a program with a graphical user interface, all of the objects will be visible when the program starts. 2. An object must be created in memory before it can be used in a program. 3. You must use a class to define an object before it can be created in memory at runtime. 4. A class specifies the data an object can hold, but not the actions the object can perform.

Suppose you wish to run two different operating systems on one computer, you can accomplish it by using _______.

A. a multi-processor operating system B. an embedded system C. the system utilities D. virtualization software