Which of the following is not a characteristic of pBR322 vector?
(a) It is the first artificial cloning vector constructed in 1977 by Boliver and Rodriguez.
(b) It is the most widely used, versatile and easily manipulated vector.
(c) It has two antibiotic resistance genes, tetR and ampR.
(d) It does not have restriction site for Sal I.
(d) pBR322 has a restriction site for Sal I.