What is the difference between Center and Approach in ATC services?

What is the difference between Center and Approach in ATC services?

• A. Center provides en-route radar service; Approach handles arrivals and departures around airports.
• B. Center handles ground control; Approach handles weather advisory.
• C. Center handles arrivals; Approach handles en-route traffic.
• D. Center provides deconfliction; Approach provides communications relay.

Answer: (D)