Which of the following statements are correct about mineral absorption in plants?

• A
  In the initial phase,ions are taken up into the outer space of cells,the apoplast. It is a passive process.
• B
  In the final phase,ions are taken slowly into the inner space,the symplast of cells and it is an active process.
• C
  Passive movement of the ions into the apoplast occurs through ion channels,transmembrane proteins,which acts as selective pores.
• D
  All of the above.