The time complexity of Ford$-$Fulkerson algorithm is $\backslash$Theta $(|$E$|*|$f$|),$ which one the following is the best explanation for getting this complexity

Select one:

a$.$ the cost of finding the augment path is $\backslash$Theta $($E$),$ and in worst case finding one path that add one flow unit to current flow

b$.$ at each step the algorithm check current flow values at each edge in order to find the amount of flow units that can flow in the graph

c$.$ because algorithm update each value in the graph flow every time we find a new augmenting path