An agile team is determining the effort required for user stories in their product backlog. Which technique should the team use to ensure estimates are made independently and then discussed collectively to utilize the wisdom of the whole group?
Using planning poker, where each member privately selects an estimation card and then revealing all estimates together for collective discussion.
Utilizing story points by having the team lead assigning points to each user story.
Applying T-shirt sizing and using the average size of all the estimates from the team members.
Conducting a session where the Product Owner assigns effort estimates.