You work as a network Exchange administrator at Company.com.The Company.com network currently consists of a single Active Directory forest containing a single domain named Company.com.The Company.com organization makes use of Microsoft Exchange Server 2010 as their messaging solution.Company.com has a business partner named Willow Bridge Ltd.you are responsible for managing an exchange server 2010 edge transport server named -ex10.willow bridge ltd has another exchange server 2010 edge transport server named -ex01.during the course of the day you receive an instruction from the cio to encrypt the smtp communications between -ex10 and -ex01.you thus need to ensure that both servers make use of a trusted certificate.What should you do？（）

A. your best option would be to configure mutual transport layer security （tls） from -ex10 and - ex01.
B. Your best option would be to run ExportEdgeConfi.ps1 script from Edge1. you should also run importedgeconfig.ps1 script from -ex01.
C. your best option would be to permit exchange server authentication from -ex10 and -ex01.
D. your best option would be to create a new edge subscription file on -ex10.thereafter the new file should be copied to -ex01.