Qualification of Datum C to A & B

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I have an application where I have datum A (plane), datum B (center point of a hole) and then datum C (center point of another hole). My callout for datum C is 10±0.2mm diameter with a true pos. of 1.5(MMC)|A|B|. How do I properly check the true position of datum C in order to quality it back to A & B? How is this done before setting up the part alignment that is constrained by all three datums together?