Which of the following are the Developers accountable for?

The Developers are the people in the Scrum Team who are committed to creating any aspect of a usable Increment each Sprint. The Developers are accountable for organizing and managing their work. Only the Developers can decide how to perform the work during the Sprint1. The Developers plan the work necessary to create an Increment that meets the Definition of Done during the Sprint Planning event. This is often done by decomposing Product Backlog items into smaller work items of one day or less. How this is done is at the sole discretion of the Developers. The Sprint Backlog is the set of Product Backlog items selected for the Sprint, plus a plan for delivering the product Increment and realizing the Sprint Goal1. The Developers are responsible for creating and maintaining the Sprint Backlog1. The Developers are not accountable for selecting the Product Owner, reporting productivity, or any other activities that are not related to creating a Done Increment that meets the Sprint Goal123. References:

Scrum Guide

What is a Developer?

Who Determines How Work Is Performed During The Sprint?

[What is Sprint Planning?]