The Fundamental Difference Between an Organism's Genotype and Its Phenotype

The fundamental difference between an organism's genotype and its phenotype is that

A) the phenotype refers to all of the genetic material in the organism, whereas the genotype represents only the genetic material that is expressed into proteins.
B) the genotype refers to the organism's genes and the phenotype refers to the non-coding segments of DNA.
C) the genotype refers to eukaryotic genes that contain both introns and exons, whereas phenotype refers to bacterial DNA that has only exons.
D) the genotype refers to all of the genetic material in the organism, whereas the phenotype represents only the genetic material that is expressed into proteins.