For subsonic compressible flow, which of these is not required to be measured separately to find the velocity of flow?

For subsonic compressible flow, which of these is not required to be measured separately to find the velocity of flow? Correct Answer Mach number

Unlike the incompressible flow, for compressible flow, even if it’s subsonic, we need other parameters to calculate speed of flow. With the knowledge of static and stagnation pressure we can calculate Mach number directly, and hence it is not required to be separately measured. We need free-stream velocity of sound to get flow velocity from Mach number.
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