When is a merger presumed to increase market power?

Question 22 options:

When the merger increases the HHI by more than 300 points and leads to a highly concentrated market.

When the merger increases the HHI by more than 200 points and leads to a highly concentrated market.

When the merger decreases the HHI by more than 100 points and leads to a highly concentrated market.

When the merger decreases the HHI by more than 50 points and leads to a highly concentrated market.