Q: Fact 1: Telephones are used for communication by two people by transmitting sound. Fact 2: Additionally, sound can be transmitted with video. Given the two facts above, what technological tool can be used for communication?

OPTIONS:
(I) electricity;
(II) satellites;
(III) biotechnology;
(IV) telescope;
(V) animals;
(VI) radiography;
(VII) telephones;
(VIII) laser;
The answer is:
(VII)