Explanation
Setting the Request object's OWD to Public Read/Write is the simplest and most efficient way to allow all employees to collaborate on requests. Option B is incorrect, since granting Modify All Data permission on all profiles would give too much access and affect other objects as well. Option C is incorrect, since creating a criteria-based sharing rule to share all records with all users would be redundant and inefficient. Option D is incorrect, since setting the OWD to Public Read Only would not allow users to edit requests3.