A school district contracts with a private therapy provider to deliver speech services under an IEP. What documentation is most critical for a federal auditor reviewing these costs?
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A
A signed contract, service delivery logs, and evidence that services were actually rendered to eligible students
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B
Only the provider's invoice and a board-approved purchase order
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C
The provider's professional license and a general services agreement
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D
A letter from the special education director confirming services were needed