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Statement $X :$ Ocean thermal energy conversion plant can operate if the temperature difference is $20 ^\circ C $or more between the water at surface and water at depth. Statement $Y :$ Wind energy farm can generate electricity only if the wind speed should be higher than $15 km/ h.$ Which is correct option for statement $X$ and $Y?$

• A
  $X$ is correct, $Y$ is incorrect.
• ✓
  Both $X$ and $Y$ are correct.
• C
  $X$ is incorrect, $Y$ is correct.
• D
  Both $X$ and $Y$ are incorrect.