Which one is correct about crossing over I genetic recombination?

(I) It occurs in tetrad stage. It occurs in pachytene of prophase I of meiosis I

(II) It occurs between non-sister chromatids of homologous chromosomes

(Ill) It is the exchange of genetic material between the homologous chromosomes

(IV) It is recombriase enzyme mediated process

(V) Recombination nodule of synaptonemal complex between the homologous chromosomes is the site of crossing over•

(VI) It causes genetic variation which is important for evolution.

(VII) It is also the reciprocal transfer of genes between the non homologous chromosomes