Among the following methods:
$(i)$ Addition of an electrolyte
$(ii)$ Electrophoresis
$(iii)$ Addition of a protective colloid
$(iv)$ Addition of an oppositely charged sol
the coagulation of a lyophobic sol can be carried out by:

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