$[$Concept$]$ Which statement aboutithe marketing concept is most accurate?

The idea of the marketing concept is that both companies and consumers can satisfy their needs.

The marketing concept can trace its roots to early Greek culture.

In using the marketing concept, companies focus on sales and advertising.

The marketing concept is most effective when production is limited and the product will sell itself.

All U$.$S$.$ firms are now operating with a marketing concept philosophy.