Explanation:

- ENIAC:

- The Electronic Numerical Integrator and Computer (ENIAC) is often regarded as the first general-purpose electronic digital computer.

- It was completed in 1945.

- It's an example of a first-generation computer.

- ENIAC is the correct answer.

- EDSAC:

- The Electronic Delay Storage Automatic Calculator (EDSAC) was an early British computer.

- Completed in 1949, it was a pioneering stored-program computer.

- It's not classified as first-generation because it marks the beginning of the second generation with stored programs.

- EDVAC:

- The Electronic Discrete Variable Automatic Computer (EDVAC) was one of the earliest electronic computers, but it was completed after ENIAC.

- It introduced the concept of a stored-program computer, which is a characteristic of second-generation machines.

- UNIVAC:

- The Universal Automatic Computer (UNIVAC) was another early computer, introduced in the 1950s.

- It represents the transition from first to second generation with improvements in technology.