They are most likely associated with the "Promotion" marketing mix element.
Explanation:
The marketing mix is made up of 7 elements which are:
-Product
-Price
-Promotion
-Place
-Packaging
-Positioning
-People
Promotion
Promotion essentially includes all the methods,ways and means you inform your customers about your product or services and how one can market the products and make sales from them.Apple's "creative pros" and "evangelists" basically promote Apple products by their activities since they make the customers know more about what Apple products can do thereby getting support for the Apple product which serves as a form of publicity for the products and as the publicity increases it would increase the sales of Apple products.Just as advertising serves to increase sales.
