Which Statement Is True About SDS-PAGE of Proteins

Multiple Choice

Which statement is true about SDS-PAGE of proteins?

A) The migration order for proteins in SDS-PAGE is the same as the order in gel filtration because both are sieving techniques.
B) Some proteins migrate toward the anode and others toward the cathode.
C) The rate of migration is inversely proportional to the logarithm of the protein's mass.
D) SDS-PAGE is purely an analytic technique and is not used to purify proteins.