Choose 1 option.

Per the AgentForce Security and Permission Management Guide, the AgentForceServiceAgentUserPsg (Permission Set Group) controls access privileges for Service Agents, including which Salesforce objects, fields, and related data they can read or interact with.

When extending an agent’s access to additional custom fields or related objects, the documented best practice is to update the existing permission set group assigned to that agent type rather than creating new or profile-based permissions. This approach maintains centralized permission governance, ensures license alignment, and avoids conflicts or redundancy across multiple permission layers.

Option B is incorrect because creating a new permission set with an Einstein Agent License is unnecessary — the permission set group already includes license mappings. Option C is not recommended, as editing the Einstein Agent User Profile can cause system-wide effects and deviate from Salesforce’s principle of least privilege.

Therefore, the correct approach is Option A – Update the Object and Field access in the AgentForceServiceAgentUserPsg permission set group, ensuring secure and proper access for the Service Agent to custom case data.