Which Is an Example of a SNP? (Select All That

Which is an example of a SNP? (Select all that apply. )

A) A single base near the neurofibromatosis gene can be a G or a T; phenotype is not affected.
B) A single base change in the gene for β globin changes an amino acid and results in sickle cell anemia.
C) Individuals with Huntington disease have more trinucleotide repeats in the coding region of the HD gene than normal individuals.
D) The most common cystic fibrosis allele has a deletion of three base pairs in the coding region of the CFTR gene.