Refer to the exhibit. Which item does B represent?

The mLOM slot is a dedicated modular LAN-on-Motherboard connector designed specifically for Cisco VIC adapters and occupies a separate, distinct location from PCIe riser slots.

Rear 2.5-inch drive bays are hot-swap storage enclosures with drive handles and activity LEDs, making them visually and functionally distinct from a PCIe riser card slot.

PCIe Riser 1 occupies a different physical position on the server rear panel than Riser 2 and is a separate labeled component in the same diagram.

PCIe Riser 2 is the second modular PCIe expansion riser on Cisco UCS C-Series rack servers, mounted at the rear of the chassis in a dedicated slot separate from Riser 1. It accepts standard PCIe expansion cards such as additional NICs, HBAs, or GPUs, and its position in the server diagram corresponds to label B as shown in the exhibit.

Power supply units are housed in dedicated bays at the rear of the server with connector ports and status LEDs, and are clearly distinguishable from PCIe riser expansion slots.