The answer is C;
https://lpic2book.github.io/src/lpic2.203.2/?h=smartd#smartmontools-smartd-and-smartctl
"smartd smartctl Two utility programs, smartctl and smartd (available when the smartmontools package is installed) can be used to monitor and control storage systems using the Self-Monitoring, Analysis and Reporting Technology System (SMART). SMARTis built into most modern ATA and SCSI harddisks and solid-state drives. The purpose of SMARTis to monitor the reliability of the hard drive and predict drive failures, and to carry out different types of drive self-tests."
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