Which of the following statements are correct?

(i) Genetic engineering or recombinant DNA technology have the key tools, i.e., restriction enzymes, polymerase enzymes, ligases, vectors and the host organism.

(ii) In the year 1963, restriction endonuclease were isolated.

(iii) The first discovered restriction endonuclease was Hind I.

(iv) Today we know more than 90 restriction enzymes that have been isolated from over 230 strains of cyanobacteria.

(v) Each restriction enzyme recognize different recognition sequences in the DNA.

(vi) Each restriction endonuclease binds to the DNA and cut each of the two strands of the double helix at specific points in their sugar-phosphate backbones.