Your company's web application, hosted on AWS Elastic Beanstalk, is suddenly returning an error code to the clients when they try to access a particular endpoint. Users are getting a response that indicates the server understood the request but refuses to authorize it. As a developer, you need to determine which HTTP error code is being returned. What is the most likely HTTP status code the application is generating?
500 Internal Server Error
401 Unauthorized
403 Forbidden
404 Not Found