I think A and B are correct answers.
Process.Plugin interface only used for flow
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_process_plugin.htm
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.
AnhTH
Highly Voted 3 years, 1 month agoLiquad
Highly Voted 3 years, 2 months agoFriedConsole2000
Most Recent 8 months, 2 weeks agoSapphire808
1 year, 1 month agolorenac2
1 year, 10 months agoJasonZhao
2 years, 9 months agoFlamebird
2 years, 11 months ago