State the English meaning of the following algebraic expressions (some of these queries are likely to yield empty results in a typical university, but this is beside the point):

a. ?CrsCode,Semester(Transcript)/ ?CrsCode(Transcript)
b. ?CrsCode,Semester(Transcript)/ ?Semester(Transcript)
c. ?CrsCode,StudId(Transcript)/ (?Id(Student))[StudId]
d. ?CrsCode,Semester,StudId(Transcript)/ (?Id(Student))[StudId]






a. Semesters in which all courses (that were ever taught) were o?ered.
b. Courses o?ered in every semester.
c. Courses taken by every student.
d. Classes (courses + semester) taken by all students.

Computer Science & Information Technology

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Answer the following statement(s) true (T) or false (F)

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____ ensure(s) the integrity of a message sent between two parties who are unknown to each other.

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What will be an ideal response?

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