Answer:
Group policy object can be applied on the OU level.
Step-by-step explanation:
This whole question is ambiguous to say the least. Group Policies can be applied the the OU (Lowest level - if you create the OU or group), the Domain and the AD Forest as long as you link the ou to the root of the AD Forest. In other words, if you wish to create a Group Policy, you also need to create an OU that you can lik it to. i.e, you want all managers to bypass the proxy settings, you create the OU, drop all the Managers in there and create the GP and apply it to the OU or group.