According to SAFe, which of the following types of work should fit into one Iteration...

According to the SAFe 6 Scrum Master documentation, the type of work that should fit into one Iteration for one team is a Story. A Story is a short description of a small piece of functionality that provides value to the customer or stakeholder. Stories are derived from Features, which are larger units of value that typically span multiple Iterations. Stories are also decomposed into Tasks, which are the specific activities that the team members perform to implement the Story. Stories are the primary backlog items that the team plans, estimates, and delivers in an Iteration. They are also the basis for defining and committing to the Iteration goals. Stories should be small enough to be completed within one Iteration, and they should meet the definition of ready and the definition of done.