Identify the A, B, C and D shown in this figure?
 

• A

  A–Holdfast, B–Air bladder, C–Midrib, D–Frond 

• B

  A–Frond, B–Midrib, C–Air bladder, D–Holdfast 

• C

  A–Air bladder, B–Midrib, C–Holdfast, D–Frond 

• D

  A–Frond, B–Holdfast, C–Midrib, D–Air bladder