Which of the following statement(s) is/are correct about pteridophytes ? (i) The main plant body is a sporophyte which is differentiated into true roots, sten and leaves. (ii) The leaves are small (microphylls) as in ferns or large (macrophylls) as in Selaginella. (iii) Genera like Selaginella and Salvinia which produce two kinds of spores–macro (large) and micro (small) spores, are known as heterospores. (iv) Common examples are Funaria, Polytrichum and Sphagnum.