Which statement regarding operations in RVSM airspace is true?

In Reduced Vertical Separation Minimum (RVSM) airspace, the regulations and standards are designed to ensure safe separation between aircraft flying at higher altitudes. Among the statements, the assertion that "all are true" indicates that there is a consensus regarding the specific requirements and restrictions that apply in RVSM airspace.

In RVSM airspace, aircraft must be equipped with operational altitude measuring systems that meet specific criteria, which are meant to ensure accurate altitude reporting. This context suggests that having one altitude system is not enough by itself; aircraft are generally required to have two operational altimetry systems to qualify for RVSM operations, thus highlighting that simply having one system is not compliant.

Altitude alert systems are essential for RVSM to provide pilots with notification when they deviate from their assigned altitude. Not having these systems contradicts RVSM safety protocols, confirming that altitude alert systems are indeed required for operations in this type of airspace.

Furthermore, RVSM airspace is primarily utilized for Instrument Flight Rules (IFR) operations rather than Visual Flight Rules (VFR) operations. This separation ensures that the airspace is managed in a way that promotes safety for aircraft flying at increased altitude density.

The collective understanding that "all are true" links to the overarching