Identify the correct order of the following major technological changes in computers from the fourth generation down to the first generation.

From the fourth generation down to the first the technologies run microprocessors, integrated circuits, transistors and vacuum tubes.

Statement 1, microprocessors, define the fourth generation with a whole processor on one chip.

Statement 3, integrated circuits, mark the third generation by packing many components onto a chip.

Statement 4, transistors, characterise the second generation, replacing bulky tubes.

Statement 2, vacuum tubes, belong to the first generation of large, hot and power hungry machines.

Each generation shrank the switching element, cutting size and power while raising speed.