Which of the following theorems can be applied to any network-linear

Which of the following theorems can be applied to any network-linear or non-linear, active or passive, time variant or time-invariant?

1. Thevenin theorem
2. Norton theorem
3. Tellegen theorem
4. Superposition theorem

Tellegen theorem can be applied to any network i.e.
• Linear or non-linear
• Active or passive
• Time variant or time-invariant