Why Was the Covenant Chain Between New York and the Iroquois

Why was the Covenant Chain between New York and the Iroquois people in the eighteenth century significant?

A) It served as a model for relations between the British Empire and other Native American groups.
B) The treaty prevented the Dutch from regaining control of the colony after the Glorious Revolution.
C) The alliance encouraged Native Americans in Massachusetts to migrate and join the Iroquois Nation.
D) It discouraged French efforts to seek a similar alliance with Iroquois people in the area.