If A, B get same wallet.dat file, and after that, if B encrypt his computer's wallet program(or daemon) (B2), then what happen?

All coins received via address generated before encryption, B can use them also?

And all coins received via address generated after encryption, only B can use them?

And all coins received via address generated after encryption at A's computer (A2), A and B can use them?


Here [use] means spending coin.