The correct answer is A. UPS.
A UPS (Uninterruptible Power Supply) is a device that provides emergency power to a computer or other electronic equipment during a power outage. This can prevent data corruption and other damage to your equipment.
A UPS works by storing a charge of electricity in a battery. When the power goes out, the UPS uses this stored energy to power your equipment for a limited amount of time. This gives you enough time to save your work and shut down your computer properly.
There are many different types and sizes of UPSs available, so it is important to choose one that is right for your needs. You will need to consider the amount of power your equipment uses and how long you need the UPS to run for.
Proper grounding is important for safety, but it does not protect against power outages. A surge protector can help to protect your equipment from power surges, but it will not protect against power outages. A sag protector can help to protect your equipment from power sags, but it will not protect against power outages.
Therefore, the only option that can ensure power is not interrupted, resulting in corrupted data is a UPS.