Which of these is named as a way that firms become cost leaders?

1. Cost leadership is built by attacking cost at several points at once. 2. The named routes are inexpensive raw materials and more efficient plant operations. 3. They also include designing products for ease of manufacture. 4. Controlling overhead costs and avoiding marginal customers complete the list. 5. Raising prices for loyal buyers is a revenue tactic and does not lower cost. 6. Adding features and widening the range both tend to raise cost rather than reduce it. _Source: OpenStax Introduction to Business (CC BY 4.0), Ch 11 "Creating Products and Pricing Strategies to Meet Customers' Needs", section 11.2 Creating a Marketing Strategy_