In the following,each set provides a conservation approach and an example of a method of conservation:
$(a)$ In situ conservation - Biosphere Reserve
$(b)$ Ex situ conservation - Sacred groves
$(c)$ In situ conservation - Seed bank
$(d)$ Ex situ conservation - Cryopreservation
Select the option with the correct match of approach and method.

• A
  $(a)$ and $(b)$
• B
  $(a)$ and $(c)$
• C
  $(a)$ and $(d)$
• D
  $(b)$ and $(d)$