Final answer:
Neither Project A with a payback period of 2.6 years nor Project B with a payback of 3 years would be accepted, as the organization's acceptable threshold for the payback period is 2.5 years or less.
Step-by-step explanation:
When considering two mutually exclusive projects, the organization in question uses the payback period (PP) decision rule, where a project is acceptable if its payback period is 2.5 years or less.
In this scenario, Project A has a payback period of 2.6 years, and Project B has a payback period of 3 years.
According to the given decision rule, neither Project A nor Project B would be accepted as their payback periods are both longer than the 2.5-year cutoff.