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​​​​Which of the following options is/are correct for the Automatic Generation Control (AGC) and Automatic Voltage Regulator (AVR) installed with synchronous generators?

  1. AGC response has a local effect on frequency while AVR response has a global effect on voltage.
  2. AGC response has a global effect on frequency while AVR response has a local effect on voltage.
  3. AGC regulates the field current of the synchronous generator while AVR regulates the generator's mechanical power input.
  4. AGC regulates the generator's mechanical power input while AVR regulates the field current of the synchronous generator.

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