What Is the Difference Between Genetic Dissection and Genome Sequencing

What is the difference between genetic dissection and genome sequencing?

A) Genetic dissection studies a single gene at a time while genome sequencing can study all the genes in a genome at once.
B) Genetic dissection studies all the genes at a time while genome sequencing can study only one gene at a time.
C) It is essential that mutations are available for genetic dissection and mutations are of no use in the study of genomes by genome sequencing.
D) The genetic dissection approach requires only wild type animals while the study of genomes by genomic sequencing requires mutants.