Which of the following statements is false:

Based on the payback rule, an investment is acceptable if its calculated payback period is less than some prespecified number of years.

A firm with low operating leverage will have low fixed costs compared to a firm with high operating leverage.

Capital intensive projects with heavy investments in plant and machinery will generally have a low degree of operating leverage.

Bond rating that are BBB or higher are rated investment quality or grade.

Maximum growth rate that can be achieved with only internal financing is called the internal growth rate.