Explanation:

When creating a custom Copilot action in Einstein Copilot (Agentforce), the primary and supported option for implementing the logic behind the action is:

✅ Salesforce Flows
Flows allow you to define business logic, interact with Salesforce data, and handle complex automation — all without writing code. These flows can be:

Autolaunched Flows
Screen Flows (used in limited cases)

When defining a Copilot Action, you can map inputs and outputs between the LLM prompt and the Flow, allowing the AI assistant to execute business processes intelligently.

A. Apex Trigger
❌ Incorrect – Apex Triggers are event-driven (e.g., before/after record changes) and cannot be directly invoked as a Copilot Action.

B. SOQL
❌ Incorrect – SOQL is a query language, not an executable action or automation logic on its own. It’s used within Apex or Flows but cannot be chosen directly as a Copilot Action.