You need to design a PKI for the Northwind Traders internal network. What should you do？（）

• A、Add an enterprise root CA to the northwindtraders.com domain. Configure cross-certification between the northwindtraders.com domain and the boston.northwindtraders.com domain
• B、Add an enterprise subordinate issuing CA to the northwindtraders.com domain. Configure qualified subordination for the enterprise subordinate issuing CA in Boston
• C、Add enterprise subordinate issuing CAs to the New York， Boston， and Seattle LANs. Configure qualified subordinations for each enterprise subordinate issuing CA
• D、Add a stand-alone commercial issuing CA to only the northwindtraders.com domain. Configure cross-certification between the commercial CA and the boston.northwindtraders.com domain