Some users need to have read and write access to a shared directory for a collaborative project. What approach should be used?

Question $2$Answer

a$.$

Change the ownership of the directory, so it belongs to three users at the same time

b$.$

Add them to a common group and grant writing permission for the group to the directory, which should belong to this group

c$.$

Add them to a common group and grant writing permission for the user and group to the directory, which should belong to the user root and group root

d$.$

Create them with the same UID