Which option gives the correct pair of technology and generation?

Correct answer: Transistor and second generation

The direct answer is A: transistor and second generation. Computer generations are commonly identified by their dominant hardware technology. The first generation used vacuum tubes; the second used transistors; the third used integrated circuits; the fourth used microprocessors; and the fifth is commonly linked with advanced processing and artificial-intelligence ideas. Because transistors replaced bulky, less reliable vacuum tubes, the transistor belongs to the second generation. Option A is correct. Option B is wrong because vacuum tubes belong to the first generation, not the fourth. Option C is wrong because microprocessors are associated mainly with the fourth generation, not the first. Option D is wrong because integrated circuits belong mainly to the third generation, not the fifth. The exact boundaries can vary slightly in textbooks, but this standard school classification is clear. Memory cue: tube-1, transistor-2, IC-3, microprocessor-4.