1-They knew about robbing the bank.
2-They had information about robbing the bank.
3-They had insight into robbing the bank.

Do these mean:

a-They had robbed the bank and they knew about it.
b-Someone had robbed the bank and they knew about it.
c-They knew how the bank could be robbed.
d-They knew how they could rob the bank.

Gratefully,
Navi.