In the 'Microservices' philosophy, why is it considered an 'Anti-Pattern' to place complex business logic (e.g., calculating tax or loyalty points) inside the API Gateway?

1. A Because Gateways are built only with C++ and cannot execute complex mathematical formulas.
2. B It creates a 'Thick Gateway' (Monolithic logic at the edge), making the Gateway hard to test, slow to deploy, and a centralized bottleneck for all development teams.
3. C It prevents the microservices from being able to access the internet.
4. D Business logic in the Gateway forces the frontend to skip authentication.