AWS Certified Developer Associate DVA-C02 Practice Question

Stage variables are the correct feature for this scenario. They are name-value pairs that can be defined for each deployment stage of a REST API, acting like environment variables. By defining a variable in each stage (e.g., lambdaName) and setting its value to the corresponding function name (my-function-dev, my-function-test), the API integration can dynamically reference this variable (${stageVariables.lambdaName}) to invoke the correct backend Lambda function without changing the core API definition. Comprehensive resource duplication is inefficient and costly. Network ACLs and security groups provide network-level isolation, but do not help configure the API's backend integration. Exclusively deploying functions per environment is part of the solution, but it is the stage variables that allow API Gateway to dynamically route to them.