What is meant by the term 'stale green light'?

Answer: C — green light that has been on for some time and will probably change soon

A This option is incorrect because a malfunctioning light is not necessarily "stale" and may not change soon. B: This option is incorrect because a light that has just turned on is not considered "stale." D: This option is incorrect because a light with reduced brightness is not necessarily "stale" and may not change soon.