Which of the following computers belongs to the first generation of computing machines?

Explanation

Option A: EDSAC Options B, C, and D represent later generations of computers. First-generation computers include machines such as ENIAC, EDVAC, UNIVAC, IBM-701, IBM-650, and EDSAC. These early computers were large, used vacuum tubes for circuitry, and magnetic drums for memory. EDSAC, developed at Cambridge University, ran its first programs in 1949 and was the earliest stored-program computer in regular operation. Input was typically via punched cards or paper tape, and output was printed. Vacuum tubes, invented by Lee DeForest, amplified signals by controlling electron flow in a vacuum, a key technology for first-generation machines.