Riverbed AppResponse is a modular platform. The foundational component is the Shark Packet Analysis (SPA) module. This base module provides the core functionalities of packet capture, storage, filtering, and deep packet inspection for network forensics and troubleshooting. All other specialized analysis modules, such as Application Stream Analysis (ASA) or Web Transaction Analysis (WTA), are licensed as add-ons that build upon the capabilities provided by the base SPA module.

B. UCA: Unified Communications Analysis (UCA) is a specialized, add-on module for monitoring and troubleshooting voice and video performance, not the base module.

C. WTA: Web Transaction Analysis (WTA) is an add-on module that provides deep monitoring of end-user experience for web and SaaS applications.

D. ASA: Application Stream Analysis (ASA) is a powerful add-on module for real-time application performance monitoring, but it requires the base SPA module to function.

1. Riverbed AppResponse 11 Product Brief: "AppResponse 11 is a modular system. The base module is Shark Packet Analysis (SPA), which provides network forensics and troubleshooting. Add-on modules include: Application Stream Analysis (ASA)... Web Transaction Analysis (WTA)... Unified Communications Analysis (UCA)..." (Page 2, "Modular and Scalable" section).

2. Riverbed AppResponse 11.12 User's Guide: "The AppResponse 11 system is modular. The base module is Shark Packet Analysis (SPA). Add-on modules include Application Stream Analysis (ASA), Web Transaction Analysis (WTA), and Unified Communications Analysis (UCA)." (Chapter 1, "Introduction to AppResponse 11," Section: "AppResponse 11 Modules").