Gene X Undergoes a Mutation Which Converts It from Wild-Type

Multiple Choice

Gene X undergoes a mutation which converts it from wild-type to mutant.Later,a second mutation in the genome in gene Y occurs which causes the wild-type phenotype of the first gene (gene X) to be restored.Respectively,what are the appropriate designations for the two mutational events?

A) Forward mutation, back mutation
B) Forward mutation, suppressor mutation
C) Reverse mutation, back mutation
D) Reverse mutation, suppressor mutation
E) Reverse mutation, forward mutation