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The correct option is a:  header 1 (<h1>). This means in calculating a relevance score based on header tags, the header tag that would have the highest relevance score would be a header 1 (<h1>).

The <header> element represents a container for introductory material or a series of navigational links. A <header> element often contains a header element or elements (h1 to h6), authoring information and  a logo or icon. The header> element was first used for headings in the very first version of HTML. It can be found on the first website. At some time, headers evolved into h1> through h6>, freeing up header> to perform a different function.

A global site header, referred to as a banner in the accessibility tree, can be defined via the "header" element. Typically, it has a firm name, logo, search function, and perhaps worldwide navigation or a tagline. Typically, it can be found at the top of the page.

In calculating a relevance score based on header tags, the header tag that would have the highest relevance score would be a

a) header 1 (<h1>)

b) header 2 (<h2>)

c) header 3 (<h3>)

d) header 4 (<h4>)

Learn more about header tags here:

https://brainly.com/question/16463073

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