How does an agile team obtain clarity on backlog items that may be picked up in subsequent iterations?

How does an agile team obtain clarity on backlog items that may be picked up in subsequent iterations?

1) Team discusses and clarifies doubts on backlog items in the iteration planning meeting

2) Product owner creates detailed user stories (Definition of ready) in the backlog before the iteration starts

3) Team can interact with the product owner multiple times during an iteration without waiting for the next iteration planning

4) Team can have backlog refinement session with the product owner during every iteration for gaining clarity on the subsequent ones

Ans -4