Identify the proper device for the third partition, on the second hard disk, on the first IDE controller on a PC system.

Linux names IDE disks sequentially as hda, hdb, hdc, hdd - where hda is the primary master and hdb is the primary slave on the first IDE controller. Partition numbers are appended as a digit with no separator, so the third partition on the second disk (hdb) is /dev/hdb3. The /dev/ prefix is required for a valid absolute device path.

/dev/hd1b3 is not valid Linux device naming syntax; IDE devices use alphabetic suffixes (hda, hdb), not numeric ones (hd1).

/dev/hdc1d2p3 invents a multi-segment notation that does not exist in the Linux device naming scheme.

dev/hdc1a3 is missing the leading slash making it a relative path, and hdc refers to the primary master of the second IDE controller, not the second disk on the first controller.

dev/hdc1b3 is also missing the leading slash and hdc again refers to the second IDE controller's first device, not the second disk on the first controller.