Choose the correct statements: 

a) Pollen-pistil interaction is a chemical process involving pollen recognition followed by promotion or inhibition of the pollen.

b) The pollen tube releases two male gametes into the cytoplasm of the antipodal cells.

c) One of the male gametes fuses with the egg cell nucleus to form a diploid zygote.

d) Triple fusion involves the fusion of male gamete with the two synergid nuclei to form the primary endosperm nucleus.

e) Double fertilization is a phenomenon unique to flowering plants involving syngamy and triple fusion.