Which component describes a cable management arm (CMA)?

• A. Enclosure housing multiple blade servers sharing power/cooling and sometimes networking.
• B. Cable management arm.
• C. A backplane that routes PCIe lanes.
• D. A management network switch.

Answer: (B)

A Cable Management Arm is a physical device that guides and supports cables as they enter and exit equipment in a rack, keeping bundles neat and reducing strain on connectors. This directly matches the purpose of a CMA: organizing and routing cables to prevent tangling and wear, while also helping with airflow and maintenance.

The other components describe different purposes: a blade enclosure houses multiple blade servers; a backplane routes PCIe lanes between components; a management network switch handles network traffic for management tasks. None of these describe cable management, which is why the arm that literally bears that name is the correct choice.