Acceptance Criteria

Correct Answer: The note is saved when a user selects the 'save' button, and a confirmation message is displayed.

The acceptance criteria stating that the note is saved when a user selects the 'save' button and a confirmation message is displayed is the best fit. It clearly defines the user's action and the expected system response, making it specific, measurable, and testable. This criterion directly addresses the basic functionality of saving notes, ensuring that the primary feature works as intended. The other options either focus on non-functional requirements like loading speed, introduce additional features such as tagging and searching, or describe enhancements like automatic saving, which are not the core acceptance criteria for the ability to save notes.

Correct Answer: User can select a book from the list, reserve it for a specific date range, and receive a confirmation of the reservation.

The correct answer focuses explicitly on the functional requirements necessary for the 'ability for a user to reserve books online', covering the selection, reservation, and instant confirmation feedback, which directly addresses the requirements specified in the user story. The wrong answers, while related to the domain of library management and offering valuable features, diverge from the core functionality of reserving books online, dealing instead with ancillary services (history and recommendations, reviewing and rating, searching and wishlisting) that do not directly enable the reservation capability as described.

Correct Answer: The user should be able to select any number of videos, add them to a new or existing playlist with a customizable name and view them in the selected playlist in the order they were added.

The first answer is the best option because it is the most detailed and captures all the aspects of functionality that a user would need: selection of multiple videos, adding them to a new or existing playlist with a name, and viewing the videos in the order they were added. This is what a complete playlist feature would look like on a video streaming platform. As for the other answers, they're not incorrect but they're not as complete. The second answer is way too general, only stating that a user should be able to add a video to a playlist. The third answer adds the ability to view videos in created playlists, but it still lacks the multiple selection and customizable naming features. The last answer adds the option of creating multiple playlists, and while it's closer to the first answer, it still falls short because it doesn't specify if a user can select multiple videos, add a custom playlist name and view videos in the order they were added.