Which of the following is true in an oligopoly?

• a.)
• Focus on telling customers how the features of a product are different from other products.
• b.)
• Determining the best price of a product is more important than its marketing.
• c.)
• Advertising will have little effect on the success of a product and is not needed.
• d.)
• Marketing is not needed since demand exists for the product and no one else supplies it.