On the Q&A Configuration page in the ACP, the instructions include this:
"Using a large and regularly changed set of questions will yield the best results. "
This is contrary to the advice the Support Team generally gives in this regard. Having a large number of questions does not increase spam protection. The question set becomes only as effective as the least effective question. Moreover, having a number of questions means that when a question is broken, there is no way of knowing which question is bad, and the whole set has to be changed. The following change to that sentence is suggested:
"Only a single proper question is necessary. If you start receiving spam registrations, the question should be changed."