Question: When evaluating the efficacy of a lock algorithm in the concurrency context, which one is NOT a measurement criterion? The algorithm must guarantee exclusive access

When evaluating the efficacy of a lock algorithm in the concurrency context, which one is NOT a measurement criterion?
The algorithm must guarantee exclusive access to the critical section
Thread intent for lock does not spin waiting
The locking run effeciently in both single processor and multi-processor environment.
All threads should make progress along their course to acquire the lock.

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