If the mother and father are both type O, the baby cannot be type AB.
No
then the baby will be O plus, or AB plus , I think .
yes
yes, it is possible.
Yes.
It's called "positive" and "negative" - yes the "A" father and "B" mother can each give a gene to produce "AB"; The Rhesus gene is either positive or negative so the baby could get either.
The father would be either AB or AA.
For a baby with AB blood type : both parents should be AB. or one is AB and the other is B. or one is A and the other is B.
Can a-mother and o+ father have ab+ baby
yes. mother can be ab negative.
The baby could be Type A, Type B, or Type AB.
yes