This question is a bit outdates. The settings are not under Settings > Advanced. But rather under Settings > Object Setup > Incidents > Types. Here you can create a new Incident Type and see that B and C is the correct answers.
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
thorodp
8 months, 3 weeks agoc50196d
9 months, 4 weeks agoTeachTrooper
11 months ago