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Which of the following descriptions represents a flow network?

A

A directed graph where each edge has a nonnegative capacity along with a single source node and a single sink node with internal nodes in between.

B

A directed graph where each edge has a weight along with multiple source and sink nodes with internal nodes in between.

C

A directed graph which contains no cycle and each node has at most two child nodes.

D

A spanning tree of a directed graph where each edge has a non-negative weight.

E

An undirected graph whose nodes can be partitioned into two distinct sets and each edge in the graph has its two ends in different sets.

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