given the blood types of the mother and the child, identify the possible blood types of the father

1. mother Blood types is A
child blood type is A
what the possible blood type of the father?

2. mother blood type is B
child blood type is AB
what the possible blood type of the father?

3. mother blood type is AB
child blood type is B
what the possible blood type of the father?

4. mother blood type is O
child blood type is O
what the possible blood type of the father?​