__________ is a design principle which means that copies of the same data unit in adjacent memory levels must be consistent.

What advantage do iris scans have over most other types of biometric factors?

A. Iris scanners are harder to deceive. B. Irises don't change as much as other factors. C. Iris scanners are cheaper than other factors. D. Iris scans cannot be easily replicated.

If a thread calls __________, then every thread waiting for the object becomes eligible to acquire the lock.

a. signalEach b. signalAll c. signal d. signalMethods