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In a VPC with Amazon API Gateway running two REST APIs, the BuyStock service is incorrectly calling CheckFunds over the internet instead of internally. Identify the solution requiring minimal code changes to ensure internal VPC communication.
A
Implementing an X-API-Key header for authorization.
B
Utilizing an interface endpoint.
C
Employing a gateway endpoint.
D
Introducing an Amazon SQS queue between the APIs.
