Correct answer - "STS" : The AWS Security Token Service (STS) is a web service that enables you
to request temporary, limited-privilege credentials for AWS Identity and Access Management (IAM)
users or for users that you authenticate (federated users). However is not supported at the time
with API Gateway.
Incorrect:
"IAM permissions with sigv4" - They can be applied to an entire API or individual methods
"Lambda Authorizer" - Control access to REST API methods using bearer token authentication as
well as information described by headers, paths, query strings, stage variables, or context
variables request parameter
"Cognito User Pools" - Create customizable authentication and authorization solutions for your
REST APIs