In the electrochemical cell $H_{2(g)}, 1 \ atm | H^{+} (1 \ M) || Cu^{2+} (1 \ M) | Cu_{(s)}$,which one of the following statements is true?

• A
  $H_2$ is cathode; $Cu$ is anode
• B
  Oxidation occurs at $Cu$ electrode
• C
  Reduction occurs at $H_2$ electrode
• D
  $H_2$ is anode; $Cu$ is cathode