For each surface shown below, select the image on the right that represents the gradient vector field for that surface.

Drag a surface in order to rotate it. Click on a gradient vector field to get a more detailed version of the image.

 
1.   2.
 
3.   4.
 
 
A
 
B
 
C
 
D
 
E
 
F

In order to get credit for this problem all answers must be correct.