Vortex dissipator systems use which method to prevent FOD?

Vortex dissipator systems use which method to prevent FOD?

• A. Variable inlet guide vanes (IGV) and/or variable first stage fan blades
• B. Variable geometry inlet ducts
• C. A protective screen in front of the engine
• D. A stream of engine bleed air blown toward the ground ahead of the engine

Answer: (D)