A technician needs to install a cost-effective storage device into a rackmount server that will be used as a VM host. This storage will be used for all VMs that run from the server. Which of the following should be used?

An optical disk drive is designed primarily for reading and writing data from optical discs such as CDs and DVDs. This type of storage is not suitable for a VM host due to its relatively slow access speeds and limited data capacity compared to other storage solutions, making it ineffective for running multiple virtual machines.

Embedded MultiMediaCard (eMMC) storage is typically used in mobile devices and low-cost laptops due to its compact form factor and lower cost. However, it lacks the performance and endurance required for a VM host, where high-speed data access and reliability are essential for handling multiple virtual machines simultaneously.

While a 15,000rpm drive offers faster performance than standard hard drives, it does not provide the redundancy that a RAID setup offers. In a VM hosting environment, the risk of data loss due to drive failure is significant, and relying on a single high-speed drive does not mitigate that risk effectively.