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Which of the following statements are correct?
(i) Ti plasmid of Agrobacterium tumefaciens is used to deliver desirable gene into plant cells.
(ii) Hind II always cuts DNA molecules at a particular point by recognising a specific sequence of six base pairs.
(iii) Separated DNA fragments cannot be visualised without staining on an agarose gel electrophoresis.
(iv) 'Ori' is the sequence responsible for controlling the copy number.
(v) DNA is a positively charged molecule.
\( \begin{array}{lll}\text { (a) (i), (iii) and (v) } & \text { (b) (i), (ii), (iii) and (iv) }\end{array} \)
\( \begin{array}{lll}\text { (c) (iii), (iv) and (v) } & \text { (d) } & \text { (i), (ii), (iii), (iv) and (v) }\end{array} \)
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