Answer:
Protected data:
Option b: Social security numbers
Option d: Minutes of confidential meetings
Public data:
Option a: CMU's online directory
Option c: CMU's spring 2018 Final Exam Calendar
Explanation:
Social security numbers (SSN) is a nine digit number that can be used to track your earning and working records. Unless it is required under specific Federal Laws, one shall not be compelled to disclose SSN number to other party and therefore this is a protected data.
Minutes of confidential meetings is self-explanatory to be considered as protected data because the information in the minutes are considered confidential.
Online directory is merely a list of contact info available to public to look up some basic contact details of relevant staff
spring 2018 Final Exam Calendar shall be public data as exam schedule is consider a public info that should be accessible to all students.