Your network contains

单项选择题 Your network contains two Exchange Server 2010 Edge Transport servers and five Exchange Server2010 Hub Transport servers. All e-mail sent from your organization to the Internet is transferred by the Edge Transport servers. You need to recommend a security solution for the organization to meet the following requirements：.Ensure that users can send encrypted messages to any other organization on the Internet .Ensure that all Exchange-related communication between Hub Transport servers and Edge Transportservers is encrypted What should you recommend？（）: A、Deploy IPsec.; B、Deploy SMTP over SSL.; C、Implement Domain Security.; D、Implement Secure/Multipurpose Internet Mail Extensions （S/MIME）.

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