A New Intern in the Purchasing Department Requires Read Access

A new intern in the purchasing department requires read access to shared documents. Permissions are normally controlled through a group called "Purchasing", however, the purchasing group permissions allow write access. Which of the following would be the BEST course of action?

A) Modify all the shared files with read only permissions for the intern.
B) Create a new group that has only read permissions for the files.
C) Remove all permissions for the shared files.
D) Add the intern to the "Purchasing" group.