Match the following techniques or instruments with their usage:

Column-$I$	Column-$II$
$(a)$ Bioreactor	$(i)$ Separation of $DNA$ fragments
$(b)$ Electrophoresis	$(ii)$ Production of large quantities of products
$(c)$ $PCR$	$(iii)$ Detection of pathogen, based on antigen-antibody reaction
$(d)$ $ELISA$	$(iv)$ Amplification of nucleic acids

Select the correct option from the following:

• A
  $(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)$
• B
  $(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)$
• C
  $(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)$
• D
  $(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)$