Which one of the following statements is TRUE for the ultras

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Which one of the following statements is TRUE for the ultrasonic machining (USM) process?

[GATE ME 2017 Set 2]

A In USM, the tool vibrates at subsonic frequency.

B USM does not employ magnetostrictive transducer.

C USM is an excellent process for machining ductile materials.

D USM often uses a slurry comprising abrasive-particles and water.