The correct answer is more than 1000 transistors.The period of fourth generation was from 1971-1980. Computers of fourth generation used Very Large Scale Integrated (VLSI) circuits.VLSI circuits having about 5000 transistors and other circuit elements with their associated circuits on a single chip made it possible to have microcomputers of fourth generation.Fourth generation computers became more powerful, compact, reliable, and affordable.As a result, it gave rise to Personal Computer (PC) revolution. In this generation, time sharing, real time networks, distributed operating system were used.All the high-level languages like C, C++, DBASE etc., were used in this generation.The main features of fourth generation are ?VLSI technology usedVery cheapPortable and reliableUse of PCsVery small sizePipeline processingNo AC requiredConcept of internet was introducedGreat developments in the fields of networksComputers became easily availableSome computers of this generation were ?DEC 10STAR 1000PDP 11CRAY-1(Super Computer)CRAY-X-MP(Super Computer) Additional InformationThe transistor count is the number of transistors in an electronic device. It typically refers to the number of MOSFETs (metal-oxide-semiconductor field-effect transistors, or MOS transistors) on an integrated circuit (IC) chip, as all modern ICs use MOSFETs.It is the most common measure of IC complexity (although the majority of transistors in modern microprocessors are contained in the cache memories, which consist mostly of the same memory cell circuits replicated many times).The rate at which MOS transistor counts have increased generally follows Moore's law, which observed that the transistor count doubles approximately every two years.