Thank you sir.
Seconded. I'll keep this in mind, especially the "management answer" theory, when preparing for the exam.
...it's just one that a surprising number of people get wrong....
This also serves as an example of why Psycho-analytics are performed on the exam Over time, (ISC)² deletes questions which are regularly answered incorrectly by those who pass. So, if most people disagree with "D", the question will eventually get kicked out, regardless of if D is right or wrong.
Although this may seem like a harmful practice of "live patient trials", there are two mitigating factors. First, new questions are not graded until they have passed muster and secondly, if you truly deserve the certificate (know your stuff, exceed the experience requirements and are able to "think like a manager") you will easily be able to afford a few "unjust" hits.
Since your goal is to pass the test, there is more value in understanding why Rob selected "D" (even if incorrectly), than there is in defending "B". The idea being that understanding another person's position helps you grow your knowledge, whereas defending a position simply cements your own belief.
On the other hand, if the goal is to "annoy Rob", have at defending "B". There is sport in that .