Question

2 nd generation computers are made up of
# vaccum tubes
# transistor
#both a and b
# none​

Answer 1

Answer:

none is the answer I think

Answer 2

Explanation:

It will be the second one Transistor

They contained all the components we associate with the modern day computer - printers, tape storage, disk storage, memory, operating systems, and stored programs, as well.

Hope it helps you

Thank you : )