Doncaster Inc. is currently assessing two projects. One project is to renovate an existing building by upgrading the heating and air conditioning to more energy- efficient equipment and then rent out any excess space that is no longer required. The other project is to demolish the existing building and replace it with a smaller building that will be more efficient in terms of costs and space usage. Which of the following best describes the relationship between these two projects?

1. Contingent
2. Interdependent
3. Mutually exclusive
4. Independent