Requirement: Low-latency, direct access to an on-premises SQL Server via FastConnect.

Option A: Internet Gateway with a public endpoint exposes the SQL Server to the internet, increasing latency and security risks—incorrect.

Option B: Service Gateway is for OCI services (e.g., Object Storage), not on-premises resources—incorrect.

Option C: FastConnect with a DRG provides a private, low-latency link. No additional OCI endpoint is needed; the SQL Server’s private IP is accessed directly via DRG routing—correct.

Option D: Private Endpoints are for OCI services within the VCN (e.g., ADB), not on-premises resources—incorrect.

Conclusion: Option C leverages FastConnect and DRG for direct, secure access.

Oracle documentation notes:

"FastConnect with a DRG enables private, low-latency connectivity to on-premises networks. Configure route tables to access on-premises resources directly; no additional endpoints are required."This supports Option C. Reference:FastConnect Overview - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks/fastconnect.htm).