A mechanism for arranging controlled access to a shared resource, like a file, is called:

Explanation

The correct answer is option 3. Concept: The lock-out control mechanism is a system for establishing controlled access to a shared resource. Any system that serves to maintain the internal environment or regulates a biological function, such as a metabolic pathway or an enzyme- controlled reaction (see homeostasis). Controls can be computed, bound, or unbound: Control over the bounds A bound control is one that gets its data from a field in a database or query. Lockout entails turning off or safe a disconnect switch, breaker, valve, spring, pneumatic assembly, or another energy-isolating mechanism. To lock the energy-isolating mechanism in the off or safe position, a device is placed over, around, or through it, and only the person attaching it attaches a detachable lock to the equipment. Hence the correct answer isLockout.