Suppose we have a database consisting of the following four relations:

Student (name, studentnumber, class, major)

Course (courename, coursenumber, credithours, department)

Section (sectionidentifier, coursenumber, semester, year, instructor)

Grade_Report (studentnumber, sectionidentifier, grade)

Specify the following queries using SQL:

1. Retrieve the names of all senior Computer Science students who have taken all courses offered by the Computer Science department.
2. Retrieve the names and numbers of all students who have a grade of I(Incomplete) in any of their courses taught by Professor Yoon.