Explanation:
there are buttons like q ans influence and me
go to me and tap settings
I think it's A because it sounds more reasonable
This is called a key attribute!
There are different types of key attributes!
Primary key is the key that is actually chosen, for example a social security number.
There is also a unique key, say our finger prints! they also uniquely identify humans, but usually we prefer to use social security number when we list people (a unique key could be a primary key if we chose so)
We could also identify people by their social security number and a name, but this is unnecessary, as social security number already gives a full identification. Such a reduntant key is called super key.
A hard disk also referred to as HDD is a rigid non-removable magnetic disk with a large data storage capacity. While a compact disk is a small plastic disc on which music or other digital information is stored in the form of a pattern of metal-coated pits from which it can be read using laser light reflected off the disc.
A line of symmetry creates two congruent figures that are mirror images of each other