Question: Before starting the while loop, the Python topological _ sort ( ) function initializes remaining _ edges as _ _ _ _ _ . Question

Before starting the while loop, the Python topological_sort() function initializes remaining_edges as _____.
Question 7 options:
an empty set
a set of all the graph's edges
a set of all edges incoming to vertices with no outgoing edges
a set of all edges outgoing from vertices with no incoming edges

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