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