What is the MOST secure way to restrict API access to users of this particular AWS account?

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A company is using Amazon API Gateway to manage its public-facing API. The CISO requires that the APIs be used by test account users only .

What is the MOST secure way to restrict API access to users of this particular AWS account?
A . Client-side SSL certificates for authentication
B . API Gateway resource policies
C . Cross-origin resource sharing (CORS)
D . Usage plans

Answer: D