What is the best description of the relationship between instructor and course in the following UML class diagram?

A UML class diagram with two components. On the left and right sides are two rectangular boxes labeled Instructor and Course, respectively. A straight line connects these two rectangular boxes. $1..*$ is specified next to the Instructor box, and $0..*$ is specified next to the Course box.

Multiple Choice

Zero$-$to$-$many

One$-$to$-$zero

Many$-$to$-$many

One$-$to$-$many