"Nitrous acid causes all possible transitions (A<-- -->G, C<-- -->T). If a protein has an alanine at position 65, what amino acid(s) would be likely to replace alanine as a result of nitrous acid mutagenesis?a. isoleucine
b. "valine, threonine"
c. threonine
d. "isoleucine, threonine, valine"
e. leucine