Which of the following statements accurately describe the erosional processes of meanders that are incising and meanders that are in equilibrium?
a) Incising meanders erode laterally, while meanders in equilibrium erode vertically.
b) Incising meanders erode vertically, while meanders in equilibrium erode laterally.
c) Both incising and equilibrium meanders erode primarily vertically.
d) Both incising and equilibrium meanders erode primarily laterally.