The first 24 bits (OUI) of a MAC address are purchased by manufacturers from the IEEE. The remaining 24 bits are assigned by the manufacturer and are not customizable by end-users. While some advanced systems allow temporary MAC address changes, the statement is false because the OUI is fixed and tied to the manufacturer.

* Adding an ONT to the OLT :
* Adding an ONT (Optical Network Terminal) to the OLT involves several steps, but the critical step is registering the ONT and binding it to the appropriate profile.
* Key Steps :
* DBA Profile : Configures dynamic bandwidth allocation for the ONT but is not mandatory during initial registration.
* ONT Service Profile : Defines services (e.g., Internet, IPTV) but is applied after the ONT is added.
* Add ONT and Bind Profile : Registers the ONT with the OLT and binds it to a pre-configured line profile. This is the essential step for adding an ONT.
* ONT Line Profile : Configures the VLAN and service parameters but is created before adding the ONT.
* Why C?
* The most critical action when adding an ONT is to register it and bind it to a profile, ensuring it is recognized and operational within the network.
Thus, the correct answer is C .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: ONT Registration.
* OLT Command Reference Guide by Huawei.