Which of the following is an accurate comparison between the eastern and western regions of Africa during the period 600-1450?

a. Both regions rejected their African cultural heritage in favor of new technology and ideas spread by Asian traders,

b. Islam spread to both regions mostly due to the activities of merchants.

c. Both regions developed centralized imperial governments to regulate and protect merchants.
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d. In addition to participating in trade routes connecting to the exterior of Africa, both also traded regularly with each other through the interior of Africa.