What is the purpose of having project groups in contract workspace?

Suppliers and Users

What is the purpose of having project groups in contract workspace? Note: There are 2 correct answers to this question
A . Project groups control which tabs of contract workspaces can accessed
B. Project groups can have roles assigned that will allow members to perform certain actions
C. Project groups can grant increased system-level permissions to users
D. Project groups allow assigned users to access workspaces when access control is applied

Answer: B,D