You are managing a project for The Warne Foundation. Similar to the last project, a project is initiated to enrich the lives of seriously ill and underprivileged children in Australia. The funds raised are distributed to charities and individuals who require financial assistance. As a project manager, you are well aware that you need to understand project stakeholders better. So, you are working with documents to get some historical information regarding stakeholder engagement on previous similar projects. Which of the below documents will be helpful to get the information? 

a. Risk management plan of the previous project 

b. Project acceptance criteria 

c. Enterprise environmental factors 

d. Organizational process assets