Which statement accurately contrasts VOR-only routes with VOR/DME routes?

Which statement accurately contrasts VOR-only routes with VOR/DME routes?

• A. VOR-only routes rely on DME distances for leg measurements.
• B. VOR-only routes require no VOR signals.
• C. VOR-only routes are only for northbound directions.
• D. VOR-only routes rely on VOR radials; VOR/DME routes use DME distances for leg measurements.

Answer: (D)