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Hole pattern position to a plane only

Looking for interpretation of the attached true position call out for a 4-hole pattern. I am not well versed in GD&T but know enough to get myself in trouble.

I've staged the part and aligned with the bottom as -A- (level and origin Z).
I probed and created 4 cylinders, then created circles at the intersections of the cylinders and -A- respectively, then used the circles to create one circle -B- and translated X,Y to -B-.
I probed plane -C- and controlled rotation around Z with plane -C-.

My question is; How is the true position calculated / reported in this case, when there are multiple holes making up one datum in reference to a plane only?

Thanks.

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