Fully identify the subunit composition of a protein from the following information. Molecular mass by gel filtration: 350 kD Molecular mass by SDS-PAGE: 200 kD and 150 kD Molecular mass by SDS-PAGE with 2-mercaptoethanol: 100 kD, 80 kD, and 70 kD -S-S- is a disulfide bond and [ ][ ] are non-covalent associations A). [100-S-S-100][80-S-S-70] B). [100-S-S-80][100-S-S-70] C). [100-S-S-100-S-70][80] D). [100-S-S-100-S-80][70] E). [100-S-S-100-S-70-S-S-80]