The correct answer is: E. None of the above
The ENIAC (Electronic Numerical Integrator and Computer) was the first electronic general-purpose computer. It was built by John Mauchly and J. Presper Eckert at the University of Pennsylvania and was completed in 1946. The ENIAC was used to calculate ballistics tables for the U.S. Army during World War II.
The ENIAC had a total of 17,468 vacuum tubes, 70,000 resistors, 10,000 capacitors, and 6,000 switches. It weighed 30 tons and occupied 1,800 square feet of floor space.
The ENIAC could perform 5,000 additions or subtractions per second, or 35 multiplications or divisions per second. It could also perform trigonometric and logarithmic functions.
The ENIAC did not store programs in its internal memory. Instead, it was programmed by plugging and unplugging cables. This made it very difficult to program and change programs.
The ENIAC was a revolutionary machine, but it was soon replaced by more advanced computers. The first computer to store programs in its internal memory was the EDVAC (Electronic Discrete Variable Automatic Computer), which was built in 1949.
The EDVAC was a major improvement over the ENIAC. It was much faster and could be programmed much more easily. The EDVAC was the first computer to use the stored program principle, which is the basis for all modern computers.