The correct permissions are View and Subscribe. In NetBackup RBAC, adding an asset to a Protection Plan is treated as subscribing the asset to that plan, not creating, updating, or managing the plan itself. Cohesity documentation describes the workflow as selecting one or more assets, clicking Add protection, choosing a protection plan, and clicking Protect; it also states that a single asset or group of assets can be subscribed to one or more protection plans. The RBAC permissions model separates plan administration from asset subscription. The role-permissions topic defines protection plans as the area used to manage how backups are performed with protection plans, while assets are managed separately under the Assets permission category.
Official NetBackup RBAC guidance states that to add assets to a protection plan, the user requires View and Subscribe permissions on the protection plan, with corresponding asset permissions to view and protect the assets. Therefore, View and Subscribe is the permission pair directly aligned with adding an asset to a Protection Plan. References/topics: RBAC role permissions, Protection Plans, Subscribe an asset or asset group, and Workload asset protection workflow.

The correct answer is C because the failure is an authorization problem on the NetBackup client, not a basic network-connectivity failure. The job output explicitly states that nbumaster8 "is not an authorized server for host nbclient1," followed by status 59: access to the client was not allowed. Cohesity NetBackup documentation maps status code 59 to "Access to the client was not allowed." The controlling configuration is the client's SERVER list. Cohesity states that the SERVER entry defines the list of NetBackup primary and media servers that can access the NetBackup client, and that media servers or other primary servers must be added for that client. Cohesity also explains that on UNIX servers and clients, the SERVER entries in bp.conf define the NetBackup servers that are allowed access, with additional entries identifying servers that can initiate scheduled backups. Therefore, the client rejected the backup request because the requesting server name was missing from the client's server list or did not match the expected resolved name. References
/topics: Status code 59, SERVER option for NetBackup clients, bp.conf, Host Properties > Clients > Servers, and NetBackup host-name authorization.