An object is an element (or instance) of a class; objects have the behaviors of their class. The object is the actual component of programs, while the class specifies how instances are created and how they behave. method: a method is an action which an object is able to perform.
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There is no technical reason for using one or the other, a computer could easily handle both variants.
The reason for hex is that it is so much more intuitive and practical to use. It is quicker to write, because it requires fewer characters. With bits, you would be very likely to miss count at some point and also wouldn't notice typos, because who actually remembers all 24 characters. The length also makes it harder to read: where does the green channel start/where is the 9th character?
Additionally, hex numbers are closer to the typical decimal system, only adding 6 symbols, while with binary you remove 8 symbols, which makes it a bit more familiar and easier to learn.
The correct answer is letter A.
A virus could get into the computer easily ruining the computer, and without protection on a computer someone could hack into the companies computers easily.