Greater resistance to electromagnetic interference and support for much longer transmission distances is correct.

Fiber optic cabling carries data as light in glass or plastic fibers so it is not affected by electromagnetic interference from power lines motors or nearby copper cables. This physical property makes fiber a reliable choice for campus backbone links between buildings and main switches where electrical noise can be present.

Fiber also exhibits much lower attenuation than copper so a single run can span tens to thousands of meters depending on the fiber type. That capacity for longer transmission distances and higher bandwidth makes fiber the practical medium for backbones that must support aggregated traffic and future growth.

Cloud Interconnect is incorrect because it describes a service or connection model for linking to cloud providers rather than a physical cabling medium for campus backbones. It does not address why one cable type would be chosen over another.

Use of standard RJ45 connectors is incorrect because RJ45 is the connector for copper twisted pair Ethernet. Fiber uses different connectors such as LC or SC and requires optical transceivers or media converters to connect to networking equipment.

Lower upfront cost and easier installation is incorrect because fiber components and termination often cost more up front and require specialized tools and skills. Fiber can lower long term costs and provide greater capability over distance but it is not generally chosen for lower initial cost or simpler installation.

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