Match the organism with its use in biotechnology.

$(a)$ Bacillus thuringiensis	$(i)$ Cloning vector
$(b)$ Thermus aquaticus	$(ii)$ Construction of first $rDNA$ molecule
$(c)$ Agrobacterium tumefaciens	$(iii)$ $DNA$ polymerase
$(d)$ Salmonella typhimurium	$(iv)$ Cry proteins

Select the correct option from the following:

• A
  $(iii), (iv), (i), (ii)$
• B
  $(ii), (iv), (iii), (i)$
• C
  $(iv), (iii), (i), (ii)$
• D
  $(iii), (ii), (iv), (i)$