[Pippoles]

Hello, I have just recently registered on this forum because I have found the community to be friendly in most aspects.
That said, could someone help me distinguish between Kendo, Kumdo and Haedong Kumdo?
I am Korean, thus I practice Kumdo. Therefore, I am not very farmiliar with Japanese terminologies in relation to Kendo. Haedong Kumdo is a bit more distinguishable than the two others, but I still would like to know the main differences between all three of them.
For example, I've heard that in Kendo, moves such as a jab to the throat is allowed. Also, I've never actually seen people who practice Haedong Kumdo spar. Is that true?
All in all, I would greatly appreciate it if the community would help me distinguish between the three commonly practiced arts.
Thank you in Advance!