Please help me with my Film Definitions.

Sound waves can travel only in the aira. trueb. false

Which of the following describes the multimedia era? a. an era in which artists created works using paint software such as photoshop, without actually programmingb. an era of interactive technology where 3-d computer graphics were used to create a virtual environmentc. an era in which most of the computer art work centered around computer programming

Which career worker installs, maintains, and repairs equipment used for communication?