At a customer site, an HP PCM+ server does not automatically discover any manageable devices
except those on the subnet where the server resides.
Which configuration step is necessary to enable wider discovery?

A.
Define a custom group for each subnet with discoverable devices.

B.
Update the SNMP community names on all undiscovered devices.

C.
Add all subnets with discoverable devices to the Managed Subnets list.

D.
Install a PCM+ Remote Agent on all subnets with discoverable devices.