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Multiple ChoiceIntermediate 45s

Circuit breaker states

A circuit breaker is in HALF-OPEN. What does it do?
Options
  1. 1Reject every call until a fixed timer expires. Then close the circuit automatically.
  2. 2Permanently route all traffic to the fallback. Never attempt to re-close the breaker.
  3. 3Allow a limited number of trial calls to decide whether to close or re-open
  4. 4Reset the failure count to zero. Close the breaker immediately.

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