In the context of the Maximum Flow algorithm, what is a "source"
and a "sink"?
A. A source is a node with the highest weight, and a sink is a node with the lowest
weight.
B. source is a node where flow is produced, and a sink is a node where flow is
consumed.
C. source is a node with the highest degree, and a sink is a node with the lowest
degree.
D. source is a node where flow is consumed, and a sink is a node where flow is
produced.