True or False: A policy trace can be enabled for any layer type.

A policy trace is a feature that allows administrators to monitor and analyze how a specific policy is applied to traffic as it passes through the proxy. This feature can be beneficial for troubleshooting and ensuring that policies are functioning as intended.

When stating that a policy trace can be enabled for any layer type, it highlights the flexibility and comprehensive nature of the policy tracing capability in Blue Coat Proxy. This means that regardless of the layer in the network stack—be it application-layer, transport-layer, or others—administrators can trace policies similarly across different types. This feature is particularly useful for understanding complex configurations and validating the behavior of policies in various contexts.

The other options suggest limitations on the types of layers where policy tracing can be applied, which do not align with the actual capabilities of the system. Enabling policy tracing across all layers provides a more holistic view of traffic management and policy enforcement, making it a powerful tool for network administrators.