which of the following is not one of the three default components listed in the inspector view of a terrain assets?
transform
terrain
terrian collider
texture

if you use the move tool then click and drag an object while holding ctrl and shift at the same time you will
resize an object
copy/clone and object
stack objects automatically
delete everything you touch

The three default components listed in the inspector view of a terrain assets are: Terrain, Terrian Collider  and Texture.

So the answer is Transform.

If you use the Move tool then click and drag an object while holding CTRL and Shift at the same time, it will snap the object to intersection points of the Collider; allowing stacking of objects automatically.

So the answer is Stack objects automatically.