According to Amazon Alexa best practices, how should an Alexa Skill Builder prevent unintentional requests against a skill’s backend when using AWS Lambda?

According to Amazon Alexa best practices, how should an Alexa Skill Builder prevent unintentional requests against a skill’s backend when using AWS Lambda?
A . Ensure that the session ID provided by the request to Lambda is not already in use.
B . Rotate the Lambda ARN regularly to prevent others from using the service.
C . Retrieve the Application ID property from the request JSON and validate it against the Lambda environment variables.
D . Provide the Lambda trigger with the Application ID so that it validates on the ask trigger.

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Answer: C