Which statement best describes the difference between AC and DC in terms of current direction?

Which statement best describes the difference between AC and DC in terms of current direction?

• A. AC periodically reverses direction; DC flows in a single direction.
• B. DC periodically reverses direction; AC flows in a single direction.
• C. Both reverse direction periodically but at different rates.
• D. They are identical in direction.

Answer: (D)