The correct answer is: A. Battery back-up unit.
A battery backup unit (BBU) is a device that provides temporary power to a computer or other electronic equipment during a power outage. This can prevent data loss and corruption, as well as damage to the equipment.
A surge protector is a device that protects electronic equipment from power surges. It does this by diverting the surge to a ground wire. However, a surge protector cannot protect against a power outage.
Multiple SIMMs strips are used to increase the amount of memory in a computer. They do not protect against power outages.
A data guard system is a system that protects data from loss or corruption. It does this by creating backups of data and by using redundant storage devices. However, a data guard system cannot protect against power outages.
Therefore, the only device that can prevent power interruptions, resulting in corrupted data, is a battery backup unit.