What is the constraint for node 2 in the following maximal flow problem? 
Definitions:
Circuit Current
The flow of electric charge in a closed path or circuit, typically measured in amperes.
Volt-Amperes-Reactive
A unit of measure for reactive power in an electrical system, indicating the non-working power in an AC circuit.
Reactive Power
The component of electrical power that does not perform any work, typified by its presence in AC circuits and measured in Volt-Amps Reactive (VAR).
Inductive Reactance
The opposition that inductance offers to alternating current, dependent on the frequency of the current.
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