Final answer:
The Knowledge Base is the best source for connection guides to troubleshoot device integration issues.
Step-by-step explanation:
The correct answer is d) Knowledge Base. A Knowledge Base is a digital repository that contains information about a particular subject or topic. It is a centralized location where users can access articles, guides, troubleshooting steps, and solutions to common problems. In the context of device integration issues, a Knowledge Base would provide connection guides that can help troubleshoot such issues.