I can't apply right now, so I'll just hope they'll correct this before it's my turn. For those who want to apply right now, this is what I would do:
Truthfully answer the question with "Yes". Then, after printing, add in handwriting "See explanation on separate page". Then, on a separate page write:
"Explanation regarding Question 9(c): As you can see in the list in question 10 (a), I resided outside Canada during the eligibility period. This is why I correctly chose "Yes" as an Answer to Question 9(c). You ask to then provide form CIT0177. However, this form does not apply to me. Yes, I resided outside Canada but No, I do not intend to claim any of that time as residence in the sense of Crown Servants working abroad. This very rare case does not apply to me and this is why I do not provide that form."