To implement the new Must Have requirement for the coffee shop insurance product website, which includes financial transaction functionality, the Business Sponsor should take the following actions:

Selected Actions for the Business Sponsor:

B. Check the viability of the project, following the inclusion of the new Must Have requirement.

E. Assess the impact of the new Must Have requirement on the original Business Case.

B. Evaluating the project's viability after adding a significant new requirement is crucial. This involves analyzing whether the project can still meet its objectives within the given constraints, such as time, budget, and resources, especially when the new requirement could potentially add complexity and cost.

E. Understanding how the new requirement affects the original Business Case is essential. This involves reassessing the project's expected benefits, costs, and risks in light of the new functionality. It ensures that the project remains aligned with business objectives and continues to offer a viable return on investment.

Why Other Actions Are Less Suitable:

A. While ensuring adherence to relevant standards is important, it is more of a task for the technical team or a specific role such as the Technical Coordinator, rather than the primary responsibility of the Business Sponsor.

C. Sourcing and hiring specific technical expertise, such as a web developer with experience in online financial transactions, is generally a responsibility delegated to the Project Manager or relevant technical leads, not the Business Sponsor directly.

D. While communicating business changes to all interested parties is important, the specific action of explaining the implications of the business change company-wide is more likely to be a collaborative effort involving several roles, including the Business Change Manager, rather than solely the Business Sponsor's responsibility.