According to the text, what is the resistance relative to fluvial erosion for each geoform in the studied area?

The terrace has a medium resistance to fluvial erosion.
The low terrace has a low to medium resistance to fluvial erosion.
The sediment bar has a very low resistance to fluvial erosion.
The terrace slope has a very low resistance to fluvial erosion.
a) Only afirmation 1 is correct.
b) Afirmations 1 and 2 are correct.
c) Afirmations 1, 2 and 3 are correct.
d) All afirmations are correct.