Correct Answer: C
Explanation:
There is 5 generation of computer available till now.
1st Generation of Computer = The period of first generation: 1946-1959. Vacuum tube based.
2nd Generation of Computer = The period of second generation: 1959-1965. Transistor based.
3rd Generation of Computer = The period of third generation: 1965-1971. Integrated Circuit based.
4th Generation of Computer = The period of fourth generation: 1971-1980. VLSI microprocessor based.
5th Generation of Computer = The period of fifth generation: 1980-onwards. ULSI microprocessor based.