Which one of the following statements is TRUE?

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Which one of the following statements is TRUE?

1. Both Pelton and Francis turbines are impulse turbines.
2. Francis turbine is a reaction turbine but Kaplan turbine is an impulse turbine.
3. Francis turbine is an axial-flow reaction turbine.
4. Kaplan turbine is an axial-flow reaction turbine.

Correct Option: D

Kaplan turbine is an axial-flow reaction turbine