In the Net Ionic Equation for the Following,what Are the Spectator

In the net ionic equation for the following,what are the spectator ions? NH₄NO₃(aq) + KCl(aq) $\rightarrow$ KNO₃(aq) + NH₄Cl(aq)

A) None of the ions are spectator ions
B) The cations are spectators; the anions are not
C) All the ions are spectators
D) The anions are spectators; the cations are not
E) The potassium ions are spectators