【单选题】
You are employed as the exchange administrator at Company.com.the Company.com network <br /> contains an exchange 2010 organization.Company.com has its headquarters in stockholm where you are located.you are responsible for managing an exchange server 2010 edge transport server named -ex05.during routine monitoring you discover that an e-mail failed to deliver to an external smtp host.you receive an instruction from the cio to determine the smtp error codes that occur when the e-mail delivery failed. <br /> What should you do？（）
A、This can be accomplished by configuring the protocol logging level on the Send connector.
B、This can be accomplished by running Queue Viewer.
C、This can be accomplished by allowing pipeline tracing.
D、This can be accomplished by running the Mail Flow Troubleshooter.
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