Sending an e-mail is an example of a system with multiple parts An e-mail program takes the input from the keyboard and changes it into a computer language output. The output language goes
through the internet system and finds the account it was sent to the message becomes the input for another e-mail program which
changes it into an output of text that the recipient can read.

What is the primary type of input and output that is used in an e-mail system?

A. Information
B. Biological
C. Material
D. Energy