Universal Containers uses Agentforce to manage its customer service operations.

The correct answer is C because Agent-to-Agent protocol is designed for interoperability between agents across different platforms, vendors, or systems. In this scenario, Agentforce must collaborate with a third-party warehouse logistics agent to request shipping reroutes. That is cross-agent collaboration, not just tool access or data retrieval. Model Context Protocol is more appropriate when an agent needs standardized access to tools, resources, or external context. Advanced Data Retrieval is not the relevant open standard for autonomous cross-platform agent collaboration. A2A provides the pattern for agents to discover, communicate, coordinate tasks, and delegate work securely across system boundaries. Salesforce’s Agentforce interoperability guidance explicitly separates MCP-style tool/context access from A2A-style agent collaboration.