Final answer:
An element's status as essential is determined by specific criteria. While certain requirements such as access control and encryption must be met for installed physical safeguards to be considered essential, the presence of fire suppression systems is not mandatory.
Step-by-step explanation:
To be regarded as essential, an element must meet certain criteria. In the context of installed physical safeguards, the minimum requirements include factors like access control, surveillance, and encryption. An element's status as essential is determined by specific criteria.
While certain requirements such as access control and encryption must be met for installed physical safeguards to be considered essential, the presence of fire suppression systems is not mandatory. However, one requirement that is not necessary for an element to be considered essential is the presence of fire suppression systems.
Fire suppression systems are important in data centers and other environments where the risk of fire is high, but they are not a mandatory requirement for all physical safeguards.