A. VLSI
B. Integrated Circuits
C. Tansistors
D. Vacuum Tubes

Solution

B. Integrated Circuits

Explanation

Third-generation computers used integrated circuits in place of transistors. With the use of integrated circuits, these computers became reliable, generated less heat, were small in size, fast, very less maintenance, and were inexpensive.

Generation	Technology
1st Gen	Vacuum Tubes
2nd Gen	Transistors
3rd Gen	IC (Integrated Circuits)
4th Gen	VLSI (Very Large Scale Integrated )
5th Gen	ULSIC (Ultra Large Scale Integrated Circuit  )