Which best describes fertilization and meiosis in the life cycle of plants?

I. These processes are part of the life cycle.
II. These processes produce gametophytes.
III. Fertilization produces a zygote, and meiosis produces haploid spores.
IV. Fertilization is used only by seedless plants; meiosis is used only by seed plants.

a I and III
b I and IV
c II and III
d II and IV