To answer this question, we need to understand the concept of security concerns in distributed environments and systems.
Option A) Knowing the proper proxy and default gateway - This option is incorrect because while knowing the proper proxy and default gateway is important for network configuration, it is not specifically related to security concerns in distributed environments and systems.
Option B) Knowing whom to trust - This option is correct because in distributed environments and systems, there are multiple entities and components involved. It is crucial to determine whom to trust and establish secure communication channels to prevent unauthorized access and data breaches.
Option C) Knowing what authentication method is most appropriate - This option is incorrect because while choosing the appropriate authentication method is important for security, it is not specifically related to distributed environments and systems.
Option D) Knowing how to resolve hostnames - This option is incorrect because while resolving hostnames is important for network communication, it is not specifically related to security concerns in distributed environments and systems.
The correct answer is B) Knowing whom to trust. This option is correct because in distributed environments and systems, ensuring the trustworthiness of entities and establishing secure communications are crucial for maintaining security.