Explanation
The Product Backlog is an ordered list of what is needed to improve the product, and it is the single source of work undertaken by the Scrum Team. The Product Owner is responsible for ordering the Product Backlog items by value, risk, priority, and dependencies. TheProduct Backlog should be transparent and accessible to the Scrum Team and the stakeholders, so that everyone can understand the scope and progress of the product development. Therefore, options A and B are true statements about the Product Backlog.
Option C is not true because the Product Backlog items can be expressed in various formats, such as user stories, use cases, scenarios, or any other way that clearly conveys the intent and value of the item. User stories are a common and useful technique, but not a mandatory one.
Option D is not true because the Product Backlog is not a fixed and complete specification of the product, but rather an emergent and dynamic artifact that evolves over time. The Product Backlog items are refined and clarified by the Product Owner and the Developers throughout the product development process, and new items can be added or removed as needed. The Product Backlog does not need to be fully defined before the first Sprint begins, but only enough to support the first Sprint Planning.
Option E is not true because the Product Owner is not the only source of ideas and requirements for the product. The Product Owner collaborates with the Developers and the stakeholders to discover, validate, and prioritize the Product Backlog items. The Product Owner may delegate the authority to add items to the Product Backlog to others, but remains accountable for the ordering and the value of the Product Backlog.
Option F is not true because the Product Backlog does not replace the communication and collaboration between the Developers and the stakeholders. The Product Backlog represents the input of all stakeholders, but it is not a substitute for direct feedback and interaction. The Developers need to engage with the stakeholders to understand their needs, expectations, and feedback, and to deliver a valuable product increment that meets the Sprint Goal and the Definition of Done. References:
* Professional Scrum Product Owner II Assessment
* Understanding and Applying the Scrum Framework
* Managing Products with Agility
* [What is a Product Backlog?]
* [Product Backlog Explained]

As a Product Owner, you are accountable for maximizing the value of the product and the work of the Scrum Team. To do this, you need to collaborate with various stakeholders, user communities and other Product Owners to understand their needs, expectations and feedback, and to align them with the product vision and strategy. You also need to work with the Developers on Product Backlog refinement, which is an ongoing activity to add detail, estimates and order to Product Backlog items. This helps the Developers to understand what is valuable and feasible to deliver in the upcoming Sprints, and to plan and execute their work accordingly. These are typical and essential work for a Product Owner in a Sprint.
The other options are not typical or effective work for a Product Owner in a Sprint. Attending every Daily Scrum is not necessary, as the Daily Scrum is an event for the Developers to inspect their progress and plan their next steps. The Product Owner can attend the Daily Scrum if invited by the Developers, but should not interfere or answer questions that are not related to the Sprint Goal or the Product Backlog. Creating financial reporting upon the spent hours reported by the Developers is not a valuable activity, as it does not reflect the outcome or the value delivered by the product. It also goes against the Scrum values of trust and respect, as it implies that the Developers are not self-managing or committed to their work. Updating the work plan for the Developers on a daily basis is also not a good practice, as it undermines the autonomy and creativity of the Developers, and reduces their ability to inspect and adapt their work based on the empirical evidence. The Product Owner should not tell the Developers how to do their work, but rather focus on what is the most valuable outcome for the product.
References:
Professional Scrum Product Owner II Certification
Understanding and Applying the Scrum Framework
Managing Products with Agility