which step must the vSphere administrator take to allow vCenter Server to reconnect?

A vSphere administrator creates a new vSphere Distributed Switch. The administrator receives
notice from the service desk that a cluster of vSphere hosts has disconnected from vCenter
Server.
This disconnect occurred immediately after the new switch was created:
This vSphere Distributed Switch is the only distributed switch managed by vCenter Server.
The virtual machines are still functional and the applications are still accessible by end users.
On the ESXi hosts, which step must the vSphere administrator take to allow vCenter Server to
reconnect?

A.
Use the Direct Console User Interface to reattach the management vmnic to the appropriate
switch

B.
Use the Direct Console User Interface to disable lockdown mode on each affected host

C.
Use the ESXi Shell to restart the mgmt-vmware service on each affected host

D.
Use the ESXi Shell to restart the vSphere Web Client service on each affected host