Which of the following is a characteristic feature of ferns?

What is true for the plant shown in the given figure?

Selaginella possesses an outgrowth proximally on the adaxial surface of its leaves. What is this structure called?

How far does $Selaginella$,one of the few living members of $Lycopodiales$ $(pteridophytes)$,fall short of the seed habit?

Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
$A.$ Prothallus stage
$B.$ Meiosis in spore mother cells
$C.$ Fertilisation
$D.$ Formation of archegonia and antheridia in gametophyte.
$E.$ Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below.

The prothallus represents: