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 chlorophyll a, d and phycoerythrin. (iii) Pteridophytes classified into four classes : Psilopsida, Lycopsida, Sphenopsida and Pteropsida. (iv) Gemmae are green, multicellular, asexual buds, which develop in small receptacles called gemma cups located on the thalli.