Which of the following statement(s) is/are correct?

i. Agar, one of commercial products obtained from Laminaria and Sargassum are used to grow microbes and in preparations of ice-creams and jellies.

ii. In phaeophyceae, major pigments are chl a, d and phycoerythrin.

iii. Pteridophytes classified into four classes : Psilopsida, Lycopsida, Sphenopsida and Pteropsida.

iv. Gemmea are green, multicellular, asexual buds, which develop in small receptacles called gemma cups located on the thalli.