Esqua Inc., a manufacturer of soaps and shampoos, claims that its latest brand of soaps, Esqua Plus, is superior to the average soap brand because, unlike other soaps, Esqua Plus combines both antibacterial and moisturizing properties and offers longer-lasting deodorant protection. In this scenario, which of the following concepts is Esqua using to encourage its customers to try its products?
a. Product testing
b. Product positioning
c. Core benefit
d. Product attribute