Answer
This is a function.
Work Step by Step
A function is a correspondence between a first set, called the domain,
and a second set, called the range,
such that EACH member of the domain corresponds to EXACTLY ONE member of the range.
---
We ask:
1. Does EACH USB drive have a storage capacity?
Yes.
2. Can a USB drive have more than one storage capacity?
No, it has EXACTLY ONE.
This is a function.
