Your company has two Active Directory Domain Services (AD DS) forests with an existing forest trust. Each forest has its own Exchange Server 2007 organization. You are configuring a cross-forest connector between the Hub Transport servers in the two Exchange 2007 organizations. You plan to use Basic authentication for the cross-forest connector. You create a service account named Account1 in the first forest. You need to ensure that Account1 can be used to authenticate with the receiving server in the second forest. To which security group should you add Account1?