A European option can only be exercised on the final day, the expiration date

A professor posts his course syllabi and past exams on the Internet. From the economic point of view, the professor's behavior

A) demonstrates the arrogance of the professor. B) better informs prospective students. C) is a costless use of scarce resources, because it avoids paper, ink, and mimeos. D) is irrational.

What is the difference between between total costs, variable costs, and fixed costs?

What will be an ideal response?