Which three options are allowed when using Classic policies? (Choose three.)

Citrix ADC Classic policies allow for rule creation based on information from different network protocol layers. The expressions used in these policies can evaluate:
A. HTTP: Layer 7 application data, using prefixes like HTTP.REQ to inspect headers, URLs, or cookies.
F. TCP: Layer 4 transport data, using prefixes like TCP to inspect source or destination ports.
D. IP: Layer 3 network data, evaluating source or destination IP addresses through expressions such as CLIENT.IP.SRC or REQ.IP.DST. These three options represent the fundamental network layers (L3, L4, L7) that form the basis for the majority of Classic policy evaluations.

B. CLIENT: While CLIENT is a valid prefix in Classic expressions (e.g., CLIENT.IP.SRC), "IP" represents the more fundamental network layer concept applicable to both client- and request-based evaluations.
C. SERVER: The SERVER prefix is exclusively used within the newer Default (Advanced) policy infrastructure and is not a valid component of Classic policy syntax.
E. DNS: Although DNS is a valid prefix for specific DNS-related features, HTTP, TCP, and IP represent more foundational concepts applicable across a broader range of common Classic policies.

1. Citrix ADC 13.1 Product Documentation, "Classic policy expression reference": This document lists the valid prefixes for Classic policy expressions. It explicitly includes HTTP, TCP, and DNS. It also shows the use of IP addresses within expressions like CLIENT.IP.SRC, confirming that IP-level data is evaluated.

Reference Location: In the list of "Prefixes for Policy Expressions," HTTP and TCP are listed. Under the CLIENT prefix section, expressions like CLIENT.IP.SRC demonstrate the use of IP data.

2. Citrix ADC 13.1 Product Documentation, "Expressions for policy evaluation" (Default policies): This document details the syntax for Default (Advanced) policies and explicitly lists SERVER as a valid prefix (e.g., SERVER.IP.SRC), confirming it is not part of the Classic infrastructure.

Reference Location: In the section "Default Syntax Expression Prefixes," the SERVER prefix is described as referring to "the server-side of the connection." This distinguishes it from Classic policy syntax.