According to international law, there are specific criteria that distinguish genocide from other crimes such as crimes against humanity or crimes of aggression.

a. extermination practices based on political affiliation
b. intent to destroy
c. mass killing of at least 50% of a groups population
d. recruitment of militias to assist in mass killings of genocide of outside groups

The correct criteria that distinguish genocide from other crimes, according to international law, are:

b. Intent to destroy: Genocide involves the intention to destroy, in whole or in part, a national, ethnic, racial, or religious group.

d. Recruitment of militias to assist in mass killings or genocide of outside groups: This is not a specific criteria that distinguishes genocide.

The remaining criteria mentioned are not accurate:

a. Extermination practices based on political affiliation: The distinction between genocide and other crimes is not based on political affiliation, but rather on the specific intent to destroy a certain group.

c. Mass killing of at least 50% of a group's population: The percentage of the group's population killed is not a specific criterion for distinguishing genocide. The focus is on the intent to destroy the group, not the number of people killed.