By default, the message tracking log files exist in %ExchangeInstallPath%TransportRoles\Logs\MessageTracking. The folder contains log files with different names, following the convention MSGTRKServiceyyyyMMdd-nnnn.log. These logs record mail activity as messages flow through the transport pipeline on Mailbox servers and Edge Transport servers. To search these logs, the investigator can use the Get-MessageTrackingLog cmdlet in the Exchange Management Shell or explore the Delivery reports tab in the Exchange admin center12. So, the correct answer is C. C:\Exchsrvr\Message Tracking\servername.log.