Which is a valid requirement for deploying the vCenter Server Appliance 6.x to a DRS cluster?

Which is a valid requirement for deploying the vCenter Server Appliance 6.x to a DRS cluster?
A . One ESXi host in the cluster must not be in maintenance mode or lockdown mode.
B . At least one host in the cluster must not be in maintenance mode or lockdown mode.
C . One ESXi host in the cluster must not be in lockdown mode.
D . All ESXi hosts in the cluster must not be in maintenance mode.

Answer: B