In vibration isolation, which one of the following statements

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In vibration isolation, which one of the following statements is NOT correct regarding Transmissibility (T)?

1. T is nearly unity at small excitation frequencies
2. T can be always reduced by using higher damping at any excitation frequency
3. T is unity at the frequency ratio of √2
4. T is infinity at resonance for undamped systems

Correct Option: B

NA