Refer to the exhibit.

The installed fiber plant is OM4 multimode fiber , and the required building-to-building distance is 350 meters . HPE Aruba Networking ' s current AOS-S/AOS-CX Transceiver Guide confirms that a compatible 10GBASE-SR transceiver operating over OM4 can support distances up to 400 meters . Therefore, the correct design modification is to use the appropriate 10G SR multimode transceiver qualified for the OM4 link , making option C the correct answer. Aruba Networks

The distinction between OM3 and OM4 is important. A conventional 10GBASE-SR connection over OM3 is typically limited to approximately 300 meters , which would not satisfy the 350-meter requirement. OM4 provides the higher modal bandwidth required for the extended 10G SR reach of approximately 400 meters .

Option B is not appropriate for the stated cabling because 10GBASE-LR is designed for single-mode fiber , normally supporting distances up to 10 km; changing to LR would also require changing the optical fiber infrastructure. Likewise, 25GBASE-SR does not solve the problem: standard 25G SR supports substantially shorter multimode distances, typically around 100 meters on OM4. A 25G LR optic similarly requires single-mode fiber. Aruba Networks

Study Guide References: AOS-S/AOS-CX Transceiver Guide; 10GBASE-SR; OM3/OM4 Multimode Fiber; Optical Reach; Campus Inter-Building Connectivity.