Which of the following is (are) true for alleles?

They can be dominant or recessive.
They can be dominant or recessive.

They can represent alternative forms of a gene
They can represent alternative forms of a gene

They can be identical or different for any given gene in a somatic cell.
They can be identical or different for any given gene in a somatic cell.

Only A and B are correct.
Only A and B are correct.

A, B, and C are correct.