Computer networks are useful because they
a. are free to use.
b. are protected from computer viruses.
c. allow people in different locations to share information and software.
d. do not require telephone lines or wires.

C. because that is the purpose of a network.

Apresentation program is a software package used to display information in the form of a slide show. it has three major functions: an editor that allows text to be inserted and formatted, a method for inserting and manipulating graphic images, and a slide-show system to display the content.

Answercomposite key;