Which of the following is the most efficient way to be able to generate more profits using a best$-$cost strategy?

Operate solely online to avoid the overhead costs

Spend more on R&D than marketing in order to create unique products and find solutions to manufacture them at a cheaper price

Spend more on marketing than R&D in order to get more customers and increase sales

Open more physical stores in order to attract customers and build a brand image which will help increase sales

Try to operate on low profit margins and increase them as the firm becomes more reputable