Describe the function and typical location of Runway End Identifier Lights (REIL).

• A. Two synchronized flashing lights located at the runway threshold to identify the field end and aid recognition.
• B. A pair of steady white lights at the touchdown zone to indicate vertical guidance.
• C. A set of runway edge lights along the sides of the runway to outline the width.
• D. A light at the far end of the runway to indicate the end.

Answer: (A)