According to the Risk Matrix table, what will be the risk level when the probability of an attack is

According to the Risk Matrix table, what will be the risk level when the probability of an attack is very low and the impact of that attack is major?

A. High
B. Extreme

C. Low

D. Medium

Reference: https://www.moheri.gov.om/userupload/Policy/IT%20Risk%20Management%20Framework.pdf (17)