What is the difference between the first four generation of computer

each generation did something new first there was no internet just codes and no camera and then it went on to sending messages but still no camera and then the internet was now avaible on computers and camera came out came and now the last generation computers are able to hack into other computers and data and contain much faster process compared to the last ones and the quality of damaging is less to occur but the old generation computers quality were great too.

~batmans wife dun dun dun

answer; i believe the correct answer is (a) all trenches must have access/egress;