Discrete math library homework

I am working on a homework question and I am not sure if I am going about the correct way of getting to the correct answer. I feel as this is a trick question. Here is the question:

In order to keep track of circulation numbers, the library asks you to note on a form, when you leave the library, which combinations of 15 subject areas and of 8 types of material (books, current journals, databases, bound journals, videotapes, microﬁlm, microﬁche, DVDs) you used. How many possible ways are there to ﬁll in a line on the form?

I was thinking of multiplying $15\cdot 8=120$. But for some reason that did not seem correct. I was also thinking of doing ${15}^{8}$. But that number seemed too large.

I am working on a homework question and I am not sure if I am going about the correct way of getting to the correct answer. I feel as this is a trick question. Here is the question:

In order to keep track of circulation numbers, the library asks you to note on a form, when you leave the library, which combinations of 15 subject areas and of 8 types of material (books, current journals, databases, bound journals, videotapes, microﬁlm, microﬁche, DVDs) you used. How many possible ways are there to ﬁll in a line on the form?

I was thinking of multiplying $15\cdot 8=120$. But for some reason that did not seem correct. I was also thinking of doing ${15}^{8}$. But that number seemed too large.