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.