What is the difference between true motion and relative motion on a radar plot?

What is the difference between true motion and relative motion on a radar plot?

• A. True motion shows movement relative to your own ship's velocity.
• B. Relative motion shows the actual movement of vessels.
• C. True motion is movement relative to your own ship's velocity.
• D. Relative motion is movement relative to your own ship's velocity.

Answer: (C)