Use the map below to answer the following question: A GIS map of southeast Greece showing elevations. Mountains are shaded brown, while all other areas are shaded green. Public Domain In the Geographic Information System (GIS) map shown above, colors have been added to show terrain and elevation. What does the brown color indicate? (4 points) a Trees on the mountains b Highest points on the mountains c Lowest points on the mountains d Snow on top of the mountains