Which statement correctly identifies Mmo and its application at high altitude?

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At high altitude the limiting factor for speed becomes Mach number rather than indicated airspeed because air is thinner and compressibility effects grow more important. The airplane is certified to operate up to a certain Mach number to avoid shock waves and excessive loads, so the controlling limit in thin air is Mmo. That makes Mmo the maximum operating Mach number at high altitude, which is why this statement is the correct identification.

Vmo is the maximum operating indicated airspeed, and it’s primarily a low-altitude limit tied to dynamic pressure before compressibility effects dominate. Vs is stall speed, the minimum speed to keep the wings flying in a given configuration. Vne is the never-exceed speed, a structural limit, while the structural cruising limit is related to a different speed (often Vno). So the Mach-based limit at altitude—Mmo—is the best description for high-altitude operation.