Your company has a main office and 10 branch offices. The network contains an Active Directory forest named contoso.com. Each office contains domain
controllers.
You have a System Center 2012 R2 infrastructure that has Operations Manager and Service Manager installed.
Each office has multiple VLANs. All switches are managed switches.

Users in the branch offices occasionally call the help desk to report that they cannot access some of the network resources in the main office.
You need to ensure that all of the ports on the switches can be monitored by using Operations Manager.
What is the best configuration to achieve the goal? More than one answer choice may achieve the goal. Select the BEST answer.

A.
A recursive discovery for the network devices by using ICMP

B.
An explicit discovery for the network devices by using ICMP

C.
A recursive discovery for the network devices by using SNMP

D.
An explicit discovery for the network devices by using SNMP