Which of the following methods would be expected to help elute (i.e., WEAKEN the binding of) proteins from an ANION EXCHANGE column with diethylamino groups in the stationary phase and a mobile phase with pH=8.0. Each correctly assigned choice (i.e., either checked or not) earns 0.25 marks. Each incorrectly assigned choice earns 0 marks. Increasing the concentration of salt (NaCl) in the mobile phase from 0.1M to 0.5 M for a protein with pl=5.0. Increasing the pH of the mobile phase from 8.0 to 9.0 for a protein with pl=7.0. Decreasing the pH of the mobile phase from 8.0 to 7.0 for a protein with pl= 7.5. Decreasing the pH of the mobile phase from 8.0 to 7.0 AND increasing the concentration of salt (NaCl) from 0.1M to 0.5M for a protein with pl=6.0