Explanation/Reference:
Explanation:
The technet article
http://technet.microsoft.com/en-us/library/hh882396.aspx
How to Connect VMM with Operations Manager" , mentions:
Install an Operations Manager Operations console on the VMM management server. (option E)

Install Operations Manager agents on the VMM management server (option E) and all hosts under

management by VMM (managed hosts). For more information, see Operations Manager Agent Installation Methods.
In Operations Manager, import the necessary management packs (option B)

About Option A: we have technet
http://technet.microsoft.com/en-us/library/dn469610.aspx
Planning
Considerations for Upgrading VMM " that mentions:
"If you have an existing connection to Operations Manager, the connection is removed during the upgrade process"
"After the upgrade process completes, you can reconfigure your connection to Operations Manager"