Which action sequences are used to achieve the agent’s goal? A. Search B. Plan C. Retrieve D. Both Search & Plan

The action sequences used to achieve the agent's goal are both Search and Plan. The agent first needs to "Search" for information or resources that can help it achieve its goal. This could involve exploring its environment or accessing stored information. Once the agent has gathered enough information, it then needs to "Plan" how to use this information to reach its goal. This could involve deciding on a sequence of actions, predicting the outcomes of different actions, and choosing the most effective action or sequence of actions. Therefore, the answer is D. Both Search & Plan.