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?

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

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Answer: A