Step 1: Understand the different marketing concepts.
- The production-oriented concept focuses on efficient production and wide distribution.
- The sales-oriented concept focuses on persuading customers to buy through advertising and sales tactics.
- The customer-oriented concept places the customer’s needs and wants at the core of the marketing strategy.
Step 2: Apply the options.
All three approaches (production-oriented, sales-oriented, and customer-oriented) are different philosophies used in marketing depending on the business objectives and customer needs.
Step 3: Conclude.
All of these marketing concepts are essential at different stages of business growth, and therefore, the correct answer is "All of these."
Final Answer:
\[
\boxed{\text{All of these}}
\]