In a Minimum Cost Network Flow Model,the Flow Balance Constraint $\ge$

Multiple Choice

In a minimum cost network flow model,the flow balance constraint for each supply node has the form

A) Flow in $\ge$ Flow out + Net supply
B) Flow out $\ge$ Flow in + Net demand
C) Flow in = Flow out
D) Flow out $\le$ Flow in + Net supply
E) Flow in $\le$ Flow out + Net demand