In a real-world environment, changing granularity requirements might dictate changes in primary key selection, and those changes might ultimately require the use of keys.

In a real-world environment, changing granularity requirements might dictate changes in primary key selection, and those changes might ultimately require the use of surrogate keys.

Explanation:

A surrogate key is a unique identity as an object or entity. It is used as an object in the database and as an entity in the modern world. Surrogate key is not a natural key hence it cannot be derived from application data.

Advantages of using surrogate key:

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answer: a, c

divide any of the y values by x values and you will always get 3 is the most simple way i can put it for you.