• Wind Rotor Coefficient of Performance ($C_p$):
• Definition: In wind energy engineering, the Coefficient of Performance ($C_p$, or power coefficient) is the dimensionless ratio of mechanical power extracted by the rotor ($P_{\text{rotor}}$) to total kinetic power available in the oncoming wind stream ($P_{\text{wind}}$):

• Betz Limit: The maximum theoretical limit for any aerodynamic rotor in an unconfined fluid stream is the Betz limit: $C_{p,\text{max}} = \frac{16}{27} \approx 0.593$ ($59.3\%$).
• Conclusion: Coefficient of performance (Option 3).

Correct option: (3) Coefficient of performance