Which location links storage devices by the label they have been assigned?

The option that links storage devices by the label they have been assigned is /dev/disk/by-label. This directory provides a way to access storage devices using a human-readable label instead of the standard device name, which can change between boots or when hardware is added or removed.

Using labels is particularly useful for managing storage devices in a more recognizable way; for example, you might label a hard drive as "Backup" or "Photos". This makes it easier to identify and mount the correct device, especially in systems with multiple drives.

In contrast, other locations have different purposes. For example, /proc/mounts provides information about currently mounted filesystems and their mount points but does not link devices by name or label. /dev/disk/by-path links devices according to the physical path from the motherboard to the device, which is not based on labels. Similarly, /dev/disk/by-uuid links devices by their universally unique identifier (UUID), which is a different method of referencing storage that does not involve labels. Thus, /dev/disk/by-label specifically fulfills the requirement of linking by the assigned labels.