I would probably say B even though the other methods might work as well
I would say it is considered as science and a bit of maths as its the 'study of abstract machines and automata'
Google Analytics, this is a common one but there are others that do the same thing.
A mean is another word for average (kind of)
I think the answer is n combination r or n permutation r.
Please mark me as brainliest.
