After $1980\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_...$

Select all correct answered that would apply to computers after $1980.$

Question $3$Select one or more:

a$.$

computer use increased greatly

b$.$

the use of computers required extensive training

c$.$

computers became available to the general public

d$.$

inexpensive computers called microcomputer were invented

e$.$

computers were used mostly by researchers and scientists