Question 13 The query: Not yet answered select id from students minus select student_id from registration; Marked out of 1.00 displays: P Flag question a. Student's ids for all students who are not registered. O b. Student's ids for all students listed in table registration O c. No results will be displayed Od. Student's ids for all students listed in table students. Question 14 What will be the output of the following query: Not yet answered Marked out of 1.00 select id.full_name from students union all select teacher_id, teacher_name, department_name from teachers: P Flag question a. A combination of the results of the 2 queries, the common results will be shown once. O b. A combination of the results of the 2 queries, the common results will be shown twice c. Error: columns data types mismatch. O d. Error: number of columns mismatch