$A$ man with blood group $A$ marries a woman with blood group $B$. What are all the possible blood groups of their offspring?

In humans,multiple alleles are seen controlling the inheritance of which of the following?

If the father gives $I^B$ allele and the mother gives $I^A$ allele,state the genotype and blood group of the offspring.

Considering the concept of multiple alleles,one individual can have only . . . . . . alleles for that character.

What are the possible blood groups of children born to parents with blood groups $A$ and $AB$?

As per the $ABO$ blood grouping system,the blood group of the father is $B^{+}$,the mother is $A^{+}$,and the child is $O^{+}$. Their respective genotypes can be:
Choose the most appropriate answer from the options given below:
$A. I^Bi / I^Ai / ii$
$B. I^BI^B / I^AI^A / ii$
$C. I^AI^B / iI^A / I^Bi$
$D. I^Ai / I^Bi / I^Ai$
$E. iI^B / iI^A / I^AI^B$