A. ENIAC
B. UNIVAC I
C. Colossus
D. Z3

Solution

A. ENIAC

Explanation

ENIAC (Electronic Numerical Integrator and Computer), completed in 1945, is considered the first electronic general-purpose computer. It was developed by John Presper Eckert and John Mauchly at the University of Pennsylvania and was used primarily for military applications during World War II.