A teach relationship between the instructor entity set and the course entity set

Question

A teach relationship between the instructor entity set and the course entity set and it requires every course must have an instructor, but some instructors may not teach any course.

Which of the following statement is true?

      
a-The participation of course in teach is total and the participation of instructor in teach is total.

      
b-The participation of course in teach is partial and the participation of instructor in teach is total.

      
c-The participation of course in teach is total and the participation of instructor in teach is partial.

      
d-The participation of course in teach is partial and the participation of instructor in teach is partial.

Explanation / Answer

c is the answer..

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