Which one of the following blood groups belongs to the category of universal recipient

A woman of blood group ‘$O$' presented a baby of blood group ‘$O$' which she claimed as her child. She brought a suit against a man of `$AB$' group as the father of the child. Which statement is correct as per your judgement

A person with blood group $‘A'$ can be given blood of which group

Genotype of blood group $‘A'$ will be

The most popularly known blood grouping is the $ABO$ grouping. It is named $ABO$ and not $ABC$, because $“O”$ in it refers to having