Which is an example of A/B Testing?

Which is an example of A/B Testing?
A . A new software release is deployed to production and tested before the previous release is removed
B . New functionality is released to a small set of customers to test that it is functioning properly
C . A new software release is deployed to different geographic regions over a period of days or weeks
D . Different versions of a website are presented online to see which one performs better

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Answer: D