When a $Cu$ rod is kept in an $AgNO_3$ solution,what is the redox reaction that occurs?

• A
  $Cu_{(s)} + Ag_{(aq)}^{+} \rightarrow Cu_{(aq)}^{2+} + Ag_{(s)}$
• B
  $Cu_{(s)} + 2 Ag_{(aq)}^{+} \rightarrow Cu_{(aq)}^{2+} + 2 Ag_{(s)}$
• C
  $Cu_{(s)} + Ag_{(aq)}^{2+} \rightarrow Cu_{(aq)}^{2+} + Ag_{(s)}$
• D
  $2 Cu_{(s)} + Ag_{(aq)}^{+} \rightarrow 2 Cu_{(aq)}^{2+} + Ag_{(s)}$