In gymnosperms, the male and female gametophyte.
I. Do not have independent free living existence. 
II. Remain within the sporangia retained on parent sporophyte. 
III. May be born on same or different tree. 
IV. Perform meiosis to produce gametes.

• A

  I and II

• B

  II and III

• C

  III and IV

• D

  I, II and III