An administrator needs to implement a security patch policy on the network that adheres to aninternal SLA. 
Which of the following actions BEST achieves this task？（）

A. Define a test server group， install the patches and if successful schedule installation on production servers.
B. Define a test server group， schedule installation on production servers and then install all updates and patches.
C. Install the patches during a non-working hour.
D. Send an email to all company users and request the best time for installation.