What does the term $$Unique Selling Proposition$($USP$)$ refer to in marketing?

$(12$pts$)$

Question $19-$ What does the term $$Unique Selling Proposition$($USP$)$ refer to in marketing?

a$)$ The specific features that make a product stand out from its competitors

b$)$ The pricing strategy used to beat competitors$$ prices

c$)$ The distribution channels used to reach customers

The overall brand image and perception in the market