A mixture of three amino acids X-(pH = 3.2), Y-(pH = 5.7, and Z-(pH = 9.7) under electrophoresis at pH = 7.7, in which direction will each componeat of the mixture move?
A. X to anode, Y and Z to cathode
B. X to anode Y stationary, Z to cathode
C. X to cathode, Y stationary, Z to anode
D. X and Y to anode, Z to cathode