Which of the following security features does Envoy provide?

Envoy provides a robust set of security features, and one of its key offerings is authorization policies and mutual TLS (mTLS) authentication. This functionality is crucial for ensuring secure communication between services in a microservices architecture.

Authorization policies allow you to define granular access controls, which help to ensure that only authorized services can communicate with one another. This is fundamental for maintaining security in environments where multiple services interact, as it helps prevent unauthorized access and misuse of services.

Furthermore, mutual TLS authentication establishes a secure connection between clients and servers by requiring both parties to present valid TLS certificates. This mechanism not only encrypts the data in transit but also verifies the identity of the communicating parties, ensuring that both the client and server can trust each other. This two-way authentication process significantly enhances the security posture of the system.

While basic firewall protection, password encryption services, and data storage encryption are important security measures, they don't specifically reflect the capabilities that Envoy offers, particularly in terms of service-to-service communication within microservices. Envoy's focus on advanced traffic management and security through mTLS and authorization policies makes option B the correct answer in the context of Envoy’s security features.