Question: Backward Breadth - First - Search ( BFS ) is utilized in Preflow - Push Algorithm for Max - Flow Problem. The name of BFS

Backward Breadth-First-Search (BFS) is utilized in Preflow-Push Algorithm for Max-Flow Problem. The name of BFS is "Backward" since ....
a.
we are looking for incoming arcs to target node t.
b.
we are looking for outgoing arcs from source node s.
c.
we are looking for incoming arcs to source node s.
d.
we are looking for outgoing arcs from target node t.

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