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For maximum power transfer between two cascaded sections of an electrical network, the relationship between the output impedance $Z_{1}$ of the first section to the input impedance $Z_{2}$ of the second section is

1. $Z_{2} = Z_{1}$
2. $Z_{2} = -Z_{1}$
3. $Z_{2} = Z_{1}^{\ast}$
4. $Z_{2} = -Z_{1}^{\ast}$