What is the difference between chart datum and tidal datum?

What is the difference between chart datum and tidal datum?

• A. Chart datum is a fixed depth reference used on charts.
• B. Tidal datum relates to water level at a given time.
• C. Chart datum changes with tides.
• D. Chart datum is a fixed depth reference used on charts; tidal datum relates to the water level at a given time (MLW, MHW, etc.).

Answer: (D)