Which method should the administrator use to create redundant management networks?

A vSphere administrator needs to add redundancy to an ESXi 5.x management network on a vSphere
Standard Switch.
Which method should the administrator use to create redundant management networks?

A.
Configure the management network vSwitch with two active uplinks

B.
Configure an additional management portgroup on the same vSwitch

C.
Create a second management network on a second vSwitch in the same subnet

D.
Create a second management network on the same vSwitch in the same subnet