Which of the following was the first mechanical computer?a. ENIACb. UNIVACc. Analytical Engined. Z3

The first mechanical computer was the Analytical Engine. This machine was designed by Charles Babbage in the 19th century. Here are the steps to arrive at this answer:

1. Understand the question: The question is asking for the first mechanical computer from the given options.

2. Research each option:

   a. ENIAC (Electronic Numerical Integrator and Computer) was an early electronic computer, not a mechanical one. It was built during World War II in the 1940s.

   b. UNIVAC (UNIVersal Automatic Computer) was also an early electronic computer, not a mechanical one. It was built in the 1950s.

   c. The Analytical Engine was a proposed mechanical general-purpose computer designed by English mathematician and inventor Charles Babbage. He proposed it in the 19th century, but it was never built.

   d. Z3 was an electromechanical computer designed by Konrad Zuse in 1941. It was the world's first working programmable, fully automatic digital computer.

3. Compare the options: Among these options, the Analytical Engine was proposed first, in the 19th century.

4. Conclusion: Therefore, the first mechanical computer among the given options is the Analytical Engine.