What colors are the taxiway lead-on and lead-off lights typically?

The correct choice is steady burning green and yellow, which are the designated colors for taxiway lead-on and lead-off lights. These lights serve a critical purpose in guiding pilots during the taxiing process, indicating where they should enter or exit a taxiway safely. The steady burning green light typically indicates the entrance to a taxiway, whereas yellow lights are used to signify that a pilot should prepare to exit. This color combination is designed to enhance visibility and provide clear guidance, ensuring safe operations on the taxiway.

Understanding the importance of these colors is crucial for pilots and ground personnel at the airport, as following the correct visual cues helps prevent taxiway incursions and ensures that aircraft navigate the airport effectively. The other options do not correspond to the standard lighting for taxiway lead-on and lead-off signals, which is essential knowledge for anyone involved in air traffic operations at an airport.