The information sent by paging system is known as a . . . . . . .

The correct answer is: D. Page

A page is a short message that is sent to a pager. A pager is a small handheld device that receives and displays pages. Pages are typically used to send messages to people who are not available by phone, such as doctors, nurses, and emergency personnel.

The other options are incorrect because:

• A note is a longer message than a page.
• A line is a unit of measurement, not a type of message.
• A message can be any type of communication, not just a page.