You work as the enterprise exchange administrator at Company.com.The Company.com network consists of a single Active Directory domain named Company.com.Company.com has an Exchange Server 2010 organization.Company.com contains the following server which has edgesync synchronization configured between them： an edge transport server named -sr15 and a hub transport server named -sr16.due to the work load， Company.com has acquired another hub transport server named -sr17.you have received instructions from the cio to make sure that -sr15 synchronizes information from -sr16 and -sr17.What should you do？（）

• A、the best option is to remove the edge subscription from -sr15. on -sr17 run the importedgeconfig.ps1 script.
• B、the best option is to copy the subscription file from -sr16 and -sr17. on -sr17 run the new-edgesubscription cmdlet.
• C、the best option is to set up a new subscription file and import it to -sr16 and -sr17.
• D、the best option is to move -sr17 to a separate active directory site.you should also set up a new subscription file on -sr15 and run the new-edgesubscriptio cmdlet on -sr17.