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 an edge transport server named - sr10 that is configured as an open smtp relay.one of the Company.com managers complained that he cannot get any e-mail from a customer the stanford.com domain name.you have received instructions from the cio to make sure that -sr10 can receive the e-mails from stanford.com. What should you do？（）

• A、The best option to set up an address rewrite entry.
• B、The best option to set up an IP Allow List entry.
• C、The best option to set up the properties of the sender filtering feature.
• D、The best option to set up the properties of the Sender ID feature.