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Electrical isolation circuit is required between power electronic devices and its gated-pulse generating circuit. The following are the possible ways of providing isolation. 

P. Pulse transformer 

Q. Optical isolators 

R. Electro-mechanical relay 

S. Capacitive coupling 

The effective way of accomplishing isolation is by providing 

A) P and Q B) P, Q and S C) P and R D) P, Q, R and S

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