A stratus cloud is characterized by its presence in low altitudes and it's the flat and hazy appearance (as you can see in the image I added). They are formed when fog lifts or when air moves close to the ground moves over a region causing cooling in it as well as an increase of humidity.
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D: Stratus. Stratus clouds<span> </span>form<span> when a layer of air is cooled from below to its dewpoint temperature and water vapor condenses into liquid droplets.</span>
System restore is a recovery feature that helps restore your system to the previous condition or point. Most computers have system restore disks which are an advantage to the users especially when the computer clashes.These disks are very effective when it comes to restoring the system to its initial state.