The suggested answer is B, C.
Three of the pre-established roles are permanent, meaning that the privileges associated with that role cannot be modified. These permanent roles are available to a stand-alone ESX or ESXi server, or to vCenter Server. The remaining eight are sample roles which can be modified as needed. These eight roles are exclusive to vCenter Server.
Below are the pre-established roles:
A permanent role that is assigned to new users and groups. Prevents a user or group from viewing or making changes to an object
✑ No Access:
A permanent role that allows users to check the state of an object or view its details, but not make changes to it
✑ Read-Only:
A permanent role that enables a user complete access to all of the objects on the server. The root user is assigned this role by default, as are
✑ Administrator:
all of the users who are part of the local Windows Administrators group associated with vCenter Server. At least one user must have administrative permissions in VMware.
A sample role that allows a user complete and total control of a virtual machine or a host, up to and including removing that
✑ Virtual Machine Administrator:
VM or host -
A sample role that grants a user access rights only to virtual machines; can alter the virtual hardware or create snapshots of the
✑ Virtual Machine Power User:
VM -
Grants user access rights exclusively to VMs. The user can power on, power off, and reset the virtual machine, as well as run media
✑ Virtual Machine User:
from the virtual discs.
Allows the user to create resource pools (RAM and CPU reserved for use) and assign these pools to virtual machines
✑ Resource Pool Administrator:
Permits a user to add new datacenter objects
✑ Datacenter Administrator:
Required to allow VMware Consolidated Backup to run
✑ VMware Consolidated Backup User:
Allows the user to consume space on a datastore
✑ Datastore Consumer:
Allows the user to assign a network to a virtual machine or a host
✑ Network Consumer:
Reference:
https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.security.doc/GUID-18071E9A-EED1-4968-8D51-E0B4F526FDA3.html