When Computing a Hillshade, "Altitude" Refers To

Multiple Choice

When computing a hillshade, "altitude" refers to:

A) The position of the light source measured between 0 degrees and 90 degrees
B) The height of the light source above the terrain
C) The position of the light source measured in 0 degrees to 360 degrees in relation to the DEM
D) The direction the shadows generated from the light source, measured between 0 degrees and 360 degrees