All are good
All plasma types are needed for transfusion in different situations.
The universal plasma is ab because it does not have anti-a or anti-b and can be transfused to all blood types a, b, ab and o.
It is important to know the ABO type of the patient to transfuse the right plasma and avoid hemolysis in patient's blood.
Knowing rh type is not necessary for plasma transfusion unless it contains red cells.