Final answer:
Selecting water-efficient plants to reduce irrigation is an example of an innovative approach that would be documented in the lessons learned.
Step-by-step explanation:
An example of an innovative approach that would be documented in the lessons learned is d) selecting water-efficient plants to reduce the amount of irrigation required. This approach demonstrates a proactive solution to conserve water resources and optimize the project's sustainability. By carefully considering the choice of plants, the project can achieve long-term water efficiency and potentially inspire similar practices in future projects.