Which of the following best explains the reasons for using axial flow impellers in crystallization and precipitation reactions?

• Crystal and precipitates are not too small, so as to ensure easy separation of the solids from the mother liquor
• Crystals and precipitates are thoroughly broken down, so as to ensure easy separation of the solids from the mother liquor
• Both (a) and (b)
• Axial flow impellers provide low shear, energy efficient mixing conditions