(A) 3
(B) 4
(C) 5
(D) 6
Details:
First Generation The period of the first generation: 1946-1959. Vacuum tube-based.
Second Generation The period of the second generation: 1959-1965. Transistor-based.
Third Generation The period of the third generation: 1965-1971. Integrated Circuit based.
Fourth Generation The period of fourth-generation: 1971-1980. VLSI microprocessor-based.
Fifth Generation The period of fifth-generation: 1980-onwards. ULSI microprocessor-based.
