Correct answer is A.
Dot Voting is an Agile technique to prioritize issues, requirements, etc. Triple Nickel is used to generate ideas in the retrospective. Planning Poker is used for estimation and Fishbone analysis is used for root cause analysis.
Pass PMI-ACP in the First Attempt : PMI-ACP Strategy
All PMI-ACP Question & Answers: Question & Answers
Learn Agile Concepts : Agile Concepts
Agile Tips & Tricks : Agile Tips & Tricks
Quiz: 30 Questions Challenge