Which type of protection for electrical power stations provide isolation against a rise in potential of station ground and also provide drainage protection against longitudinally-induced voltages?

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Which type of protection for electrical power stations provide isolation against a rise in potential of station ground and also provide drainage protection against longitudinally-induced voltages?
A . Isolating transformers
B. Neutralizing transformers
C. Mutual drainage reactors
D. Unit-type neutralizing transformers
E. 2-winding neutralizing transformers

Answer: A