Absolute and relative refractory periods differ in what way?

• A. Absolute: no AP possible; Relative: any stimulus triggers AP
• B. Absolute: higher-than-normal stimulus needed; Relative: no AP
• C. Absolute: no AP possible; Relative: higher-than-normal stimulus is needed
• D. Absolute: AP can be triggered with minimal stimulus; Relative: AP cannot be triggered

Answer: (C)