Which of the following is among the three competitive factors that impact only. Internet sales and market share in a region?

The average retail price charged for the models available at the company's websites and whether online buyers get free shipping on their orders

The size of the per pair mail$-$in rebates on the purchases of online buyers

Company expenditures for merchandising support paid to third$-$party online retailers

The appeal of the videos, pictures, and commentary of the celebrities who are under contract to endorse a company's branded footwear that are posted prominently at numerous locations on company websites

The number of branded models$/$styles that each company has designed and produced for exclusive sale at its company websites$--$such models$/$styles cannot be obtained anywhere else