An architect receives a contractor's Application for Payment that includes a request for payment for materials stored securely at an off-site warehouse. According to AIA A201-2017, General Conditions of the Contract for Construction, which of the following is a prerequisite for the architect to certify this portion of the payment?
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A
A verbal confirmation from the contractor that the materials are insured.
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B
A photograph of the materials provided by the contractor's supplier.
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C
Prior written approval from the Owner for payment of off-site stored materials.
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D
A standard purchase order for the materials.