Explanation
Setting the OWD for internal users to Public Read Only is the simplest and most efficient way to give access to all internal employees to the ServiceFeedback object. Option A is incorrect, since creating a trigger on ServiceFeedback to change ownership to an internal employee would be complicated and affect the data quality. Option B is incorrect, since ensuring all the internal users are above the partners in the role hierarchy would not work, as the role hierarchy does not apply to partner users. Option C is incorrect, since creating an owner-based sharing rule for all ServiceFeedback records owned by partners would be redundant and inefficient