This question is a piece of cake! I bet the exam writers are struggling to come up with tougher MX record questions. 'Oh no, the PriNS server is going to take over the world with its email prowess!'
I'm not sure about option A. The preference value doesn't necessarily determine the amount of email received. The MTAs may handle load balancing differently.
Option B is correct. The primary MTA for the example.com domain is mx.hosted.com, as indicated by its lower preference value of 10 compared to mx.example.com's preference of 20.
Eleonore
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