The vortex dissipators installed on some turbine-powered aircraft to prevent engine FOD utilize which method?

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

Answer: (D)