A : undefined
B: Zero
C: Positive
D:Negative
![A undefined B Zero C Positive DNegative class=](https://us-static.z-dn.net/files/d6a/a5364aebe02ffa6e61dbd871a77407c9.png)
Answer:
Undefined
Step-by-step explanation:
There really is no explanation. All vertical lines have an undefined slope.