The correct answer is C because Salesforce Life Sciences Cloud provides the Lsc4ce.EmailQueueProcessor interface for using a third-party email service. Salesforce Help for using a third-party email service states that administrators should create a global Apex class that implements the Lsc4ce.EmailQueueProcessor interface. This interface is the supported extension point for handing off Life Sciences email operations to an external email provider instead of relying only on Salesforce’s standard email sending behavior and limits.

This scenario is specifically about emails sent from the Agentforce Life Sciences mobile app. Salesforce’s Field Email capability is designed to streamline compliant email creation, sending, and tracking for Life Sciences users, and the developer documentation describes LifeScienceEmail as representing a collection of sendable messages that manages creation, sending, and tracking of email communications. When an organization needs an external provider to send those emails, the custom Apex implementation must process the queued email operation and pass it to the third-party service.

Option A is incorrect because Lsc4ce.ExternalEmailHandler is not the interface identified by Salesforce for third-party email service handoff. Option B is also incorrect because Lsc4ce.MessagingService is not the documented Life Sciences email queue processing interface. Therefore, the consultant should implement Lsc4ce.EmailQueueProcessor .

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