Which is true regarding networks?

a) local area networks are web-based.
b) local area networks can be used to connect computers all the way across the country.
c) wide area networks allow users to share files with a secure connection.
d) wide area networks do not provide secure connections.

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.