Which Best Describes the "Optimize" Ad Rotation Setting in AdWords

Multiple Choice

Which best describes the "Optimize" ad rotation setting in AdWords?

A) The AdWords system automatically shows the most relevant display URL for each ad.
B) The AdWords system automatically shows the better performing ads more often.
C) Two of the ads from the ad group may show to a user on the same page.
D) The ability to show ads more often to increase impressions.