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.

Let us analyze each protection scheme:

Type A Protection :

Protects only the trunk fiber (between the OLT and the splitter).

Does not protect branch fibers.

Type B Single-Homing Protection :

Protects the trunk fiber but does not extend protection to branch fibers.

Type B Dual-Homing Protection :

Similar to Type B single-homing but uses two OLTs for redundancy. Still does not protect branch fibers.

Type C Protection :

Provides end-to-end protection , covering both the trunk and branch fibers.

Uses redundant fibers and splitters to ensure continuity in case of failures in either the trunk or branch fibers.

Thus, the correct answer is D , as Type C protection is the only scheme that protects branch fibers.

References:

HCIA Huawei ACCESS Official Documentation , Chapter: GPON Protection Mechanisms.

GPON Redundancy and Protection Schemes by Huawei.

Comprehensive and Detailed Step by Step Explanation:

A (Incorrect):  ADSL2+ uses sub-carriers up to  511  (2.2 MHz bandwidth).