Explain about about the cl- transporter

Question

Problem:

Question: why is the answer K+/cl- symporter?

Chloride ion (Cl-) concentrations are approximately 10x higher outside of cells than inside. Imagine you discovered a new protein that was required in liver cells for transporting Cl- out of the cell, and further found that this protein was only active when the Na+/K+ ATPase was active.

Question: Which of the following might you reasonably conclude about the Cl- transporter?

1. It could be a Na+/Cl- symporter.
2. It could be a K+/Cl- symporter.
3. It could be glucose/Cl- antiporter.
4. All of the above

Please suggest correct answer.