In Following the International Norm Concerning Tax Jurisdiction,how Would Double

In following the international norm concerning tax jurisdiction,how would double taxation be eliminated?

A) The subsidiary's home country would allow tax credits for taxes paid to the parent's home country.
B) The parent company's home country would allow tax credits for taxes paid to the subsidiary's home country.
C) The home countries of both the parent and the subsidiary would forego taxation on the income earned by the subsidiary.
D) none of the above