What is the standard reduction potential defined relative to?

• A. The standard reduction potential E° is the potential for a half-reaction at standard conditions relative to the standard hydrogen electrode.
• B. The standard reduction potential E° is the potential of a full cell at standard conditions.
• C. The standard reduction potential E° is the potential for a half-reaction at zero activity.
• D. The standard reduction potential E° is the potential difference between two nonstandard electrodes.

Answer: (A)