marketing is about making sure the brand and its marketing are as personally relevant as possible to as many customers as possible–a challenge, given that no two customers are identical.

personalized

Explanation:

The term being described in this question is known as personalized marketing. Also known as one-to-one marketing or individual marketing, this marketing strategy is when organizations use specific generalized data analysis and digital technology in order to deliver special personalized advertisement messages to a select group of potential customers. This is done in order to get the right product in front of the right people who are more likely to buy that product.

metallurgy is your answer

the "study of metals and the process of refining ("

note that it says metal. metallurgy has the word "metal" in it, and so is most likely your answer (and is your answer).

~

fractionally backed paper money

fiat money

paper money

metallic money