Computers bullt before the First Generation of computers were:
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Answer: B) Electro-mechanical
Computers built before the first generation of electronic computers were generally electro-mechanical computers. These machines used a combination of electrical components and mechanical parts, such as switches, relays, and moving components, to perform calculations.
For example, the Harvard Mark I (1944) was an electro-mechanical computer that used electromechanical relays and mechanical components to process data.
The first generation of electronic computers (approximately 1940s–1950s) primarily used vacuum tubes for processing.
Source: Scan #3 page 1 Q377