As a server administrator for your company's private cloud, you have been directed to use dependable hard drives in the server to host a virtual environment, so that employees can be provided with the necessary services. Which of the following options BEST characterizes the reliability of hard drives?

Mean time between failures (MTBF) is a metric that quantifies the reliability of a hardware component. Mean time to repair (MTTR) refers to the average duration required to repair or replace a failed device or component. Recovery point objective (RPO) refers to the timeframe within which a company can tolerate irretrievable data loss between backups. Annual loss expectancy (ALE) is the outcome of multiplying the annual rate of occurrence (ARO) by the single loss expectancy (SLE).