Question

what was the role of relay systems in computers before computers became completely electronic? a. relay systems processed information using a system made up entirely of vacuum tubes. b. relay systems stored information by using gears and rods to move mechanical parts in the computer. c. relay systems helped output information by communicating with the printers drivers so users could read data. d. relay systems passed on information using electromagnets and metal strips to conduct electricity that turned on a switch.

Explanation:

Answer:

D. Relay systems passed on information using electromagnets and metal strips to conduct electricity that turned on a switch.