Final answer:
Option c) Cisco Prime Infrastructure (PI) is the traditional Cisco management platform in question which is based on a browser GUI, does not support SDA, and is used for network operations and diagnostics.
Step-by-step explanation:
The traditional enterprise Cisco management platform you are asking about, which relies on a browser-based GUI, does not support Cisco SDA, and is used for network operations and diagnostics, is c) Cisco Prime Infrastructure (PI).
Cisco DNA Center is a newer software-defined network controller that also has network management capabilities and supports Cisco SDA. Cisco IOS 15 is an operating system for Cisco routers and switches, and Cisco Network Assistant is a standalone network management product that provides a limited set of management features for basic networking.