MC Cable secured to sheetrock above grid ceiling

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Johnhall30

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Code opinions?

MC Cable secured to fire rated assembly above a grid ceiling, using 1/2'' EMT straps. (2) layers of 5/8'' sheetrock on underside of structural framing for a one hour assembly between 1st and 2nd floor. See picture below

The inspector says the MC cable must be above the sheetrock and ran within the joists.

I do not see anything in the NEC that would prevent this, and I believe the screws through the fire rated assembly do not compromise the fire rating per the IBC.
 
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