what is a class in css?

a grouping of html tags for which style properties can be declared

a selector used to define a unique style

a tag used to apply styles to a block of content

the part of a declaration describing the type of style to be applied

for your !

A class in css is a the part of a declaration describing the type of style to be applied .

Explanation:

A class in css is a selector used to define a unique style. A class can be assigned to multiple elements in html unlike id's which can only be assigned to a single element. Class contains all the declaration of styles to be applied to the html block containing that particular class Id.

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the correct answer is: a.)it is never appropriate to use acronyms and emoticons in business communication.