I WILL BRAINLIST IF YOU GET THIS CORRECT PLEASE HELP!!! Which of these describes the relationship that Kush and Egypt had before 1500 BCE? (1 point)

Kush and Egypt were trading partners, which led to a rise in the merchant class of both cultures.
Kush provided protection for Egypt's southern border in exchange for Egyptian metals, grains, and minerals.
Egypt and Kush were trade partners who also acted as allies when one or the other was under attack.
Egypt and Kush were constantly battling over resources, labor, and borders.