Two networks are said to be dual when

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ESE Electrical 2016 Paper 1: Official Paper

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Their node equations are the same
The loop equations of one network are analogous to the node equations of the other
their loop equations are the same
None

Answer 1

Duality:

Two electrical networks are said to be dual networks if the mesh equations of one network are equal to the node equation of others.
Identical behavior patterns observed between voltages and currents in two circuits illustrate the principle of duality.
The dual networks are based on Kirchhoff Current Law and Kirchhoff Voltage Law.

Some important dual relations are given below.