When performing sales mix analysis, which one of the following is true: a. Making changes to the sales mix will likely cause O no change in the breakeven point b. The sales mix is usually assumed to change. C. Normally the calculation of the breakeven point for multiproduct is much simpler than that for a single product. d. Producing and selling more units of the product with a higher contribution margin would likely decrease the breakeven point O e. Shifting the sales mix to the product with a lower contribution margin will likely increase the overall contribution margin O