Which of the following is used to detect the bad sectors in a hard disk under Linux environment?

Badblocks is a Linux command-line tool that reads every block on a specified device (e.g., /dev/sda) to identify sectors that cannot be reliably read or written, and its output can be passed to e2fsck to permanently mark those blocks as unusable in the file system.

CheckDisk is a Windows graphical disk checking feature and does not exist as a utility in Linux environments.

ScanDisk is a legacy disk repair tool from MS-DOS and early Windows versions and has no equivalent in Linux.

CHKDSK is a Windows command-line tool that checks and repairs NTFS or FAT file system errors and is not available in Linux environments.