So the question is, which of these involve cryptology?

So a better name for the course would be cryptology.

And cryptology is the science of secrets which is really what this course is all about.

So that's enough to answer the first quiz, and the first quiz will check that you understand the definition of cryptology.

So the key point is that secrets are all around us, that they're very useful for solving problems, you're using cryptology all the time, every day.