An API developer is improving an application code to prevent DDoS attacks. The solution needs to accommodate instances o

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An API developer is improving an application code to prevent DDoS attacks. The solution needs to accommodate instances of a large number of API requests coming for legitimate purposes from trustworthy services. Which solution should be implemented?

A. Restrict the number of requests based on a calculation of daily averages. If the limit is exceeded, temporarily block access from the IP address and return a 402 HTTP error code.
B. Implement REST API Security Essentials solution to automatically mitigate limit exhaustion. If the limit is exceeded, temporarily block access from the service and return a 409 HTTP error code.
C. Increase a limit of replies in a given interval for each API. If the limit is exceeded, block access from the API key permanently and return a 450 HTTP error code.
D. Apply a limit to the number of requests in a given time interval for each API. If the rate is exceeded, block access from the API key temporarily and return a 429 HTTP error code.