Why is it important to include your ground rules in the written contract of the contracting phase of Organization Development?

A$.$ If something should unexpectedly change $($who the client is$,$ people can be fired, laid off or promoted away$).$ You'll want to have your expectations and their expectations well documented.

B$.$ Disagreements can occur regarding ownership of data

C$.$ Disagreements can occur regarding confidentiality of employees

D$.$ All of the above