Final answer:
The key self-service functions of a Customer Support Portal include the Community for user interaction, the Knowledge Base for informational resources, and the function to Open An Incident for direct support requests.
Step-by-step explanation:
The key self-service functions of a Customer Support Portal typically include A) Community, B) Knowledge Base, and C) Open An Incident. The Community section allows users to interact with other customers to share ideas, solutions, and gather collective knowledge. The Knowledge Base is an essential part of customer support, providing a comprehensive database of articles, FAQs, and problem-solving guides that customers can access to find answers to their questions. Lastly, the Open An Incident function enables customers to report issues or problems directly to the support team for assistance.