You work as the enterprise exchange administrator at TestKing.com. TestKing.com makes use of Microsoft Exchange Server messaging solution. The TestKing.com network consists of a single ActiveDirectory domain named testking.com. TestKing.com is configured to run an exchange 2010 environment. You are planning to design the installation of numerous Mailbox servers. TestKing.com Service LevelAgreement （SLA） requires the following： * The servers need to support 1，500 concurrent connections to mailboxes.* The servers need to maintain a latency of less than 20 milliseconds. You ensure deployment success you need to ensure that your design comply with the Service LevelAgreement （SLA） of TestKing.com. What should you do？（）

A. The best option is to use the Exchange Server User Monitor （ExMon） tool to check if your design meets the requirements.
B. The best option is to use the Exchange Server Load Generator （LoadGen） 2010 tool to check if your design meets the requirements.
C. The best option is to use the Exchange Server Connectivity Analyzer （ExRCA） tool to check if your design meets the requirements.
D. The best option is to use the Exchange Server Jetstress 2010 tool to check if you design meets there quirements.