The reaction between aqueous solutions of sodium chloride and silver nitrate is an example of
both (a) and (b)
Those reactions in which two compounds react by exchanging ions to form two new compounds are called Double Displacement Reactions.
For Example :
Precipitation Reaction: It is a type of double displacement reaction that results in the formation of precipitates.
Solid precipitates are being formed in the form of silver chloride(AgCl)as a result of double displacement after the exchange of ions.
Hence it is both A and B.
Therefore, option(c) is correct.