By applying an ___________ a style can be applied to just

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By applying an ___________ a style can be applied to just a single tag.

1. id rule
2. class rule
3. element rule
4. All of above
5. None of these

Correct Option: A

By applying an id rule, a style can be applied to just a single tag. For example, if we name a tag with a unique id attribute as follows
<tag id="id-value">Affected Text</tag>