Which technology was used in the first electronic digital computers instead of transistors?*Magnetic tapeMicroprocessorsVacuum tubesIntegrated circuits

The technology used in the first electronic digital computers instead of transistors was vacuum tubes.

Explanation

1. Historical Context: The earliest electronic computers, such as the ENIAC (Electronic Numerical Integrator and Computer), utilized vacuum tubes to perform their calculations and process information. Vacuum tubes served as switches and amplifiers in the circuits.

2. Vacuum Tubes vs. Transistors: Vacuum tubes were bulky, generated a lot of heat, and consumed a considerable amount of power. They were eventually replaced by transistors in the 1950s, which allowed for smaller, more efficient, and more reliable computers.

3. Outcome: Vacuum tubes are a significant part of computer history, marking the transition from mechanical computing devices to electronic computing that paved the way for modern computers.

Thus, the correct answer is vacuum tubes.