Which of the following is not true?

a.
video documentaries allow people to understand concepts, places, people, or topics that they might not otherwise be exposed to.
b.
intranet is a network of computers found in a office, school, or other organization.
c.
the internet is a system of hypertext documents linked together via satellites which transmit signals to various broadcasting stations.
d.
the main problems with the kinetoscope were that only one person could view the image or set of images at a time, and there was no sound.