In what way or ways does or do seedless vascular plants differ from seed plants?

In what way or ways does or do seedless
  vascular plants differ from seed plants?
 
  a. seedless vascular plants do not have a
  sporophyte stage; seed plants do
  b. the sporophyte of the seed plants gives rise
  to gametes; the sporophyte of seedless
  vascular plants gives rise to spores
  c. the gametophyte of the seedless vascular
  plants is free-living; the gametophyte of
  seed plants is not
  d. the sporophyte of seedless vascular plants is
  haploid; the sporophyte of the seed plants is
  diploid
  e. the gametophyte of the seed plants form
  spores; the gametophyte of the seedless
  vascular plants form gametes

Question 2

Which of the following plants are capable of
  secondary growth?
 
  a. ferns
  b. horsetails
  c. club mosses
  d. conifers
  e. liverworts