Which of the following accurately describes sdb in Linux?

The term "sdb" in Linux refers to a second SCSI device. In the context of Linux, device names follow a specific naming convention where "sd" stands for SCSI disk, and the letter that follows indicates the order of the devices recognized by the system. Thus, "sda" would be the first SCSI device, "sdb" the second, and so on.

Additionally, the naming also extends to USB storage devices. In many Linux systems, USB drives are treated as SCSI devices by the operating system. Therefore, a USB storage device will also be represented with an "sd" designation, such as "sdb" for the second device detected.

This is why the choice that includes both SCSI and USB devices is appropriate, as both types of devices utilize this naming convention in Linux.