If a Plateau Is Eroded by Gullies, the Remaining Plateau

If a plateau is eroded by gullies, the remaining plateau would be a flat (planar) area bounded by an irregular, many-sided polygon. In the TIN model

A) it would be represented by the irregular, many-sided polygon
B) it would be represented by a number of triangles, each at a different elevation
C) it would be represented by a number of triangles, each at the same elevation
D) it cannot be represented