Which basis for prioritization refers to the effort and resources required for implementation?

The basis for prioritization that refers specifically to the effort and resources required for implementation is cost. In the context of requirements prioritization, cost involves evaluating how much time, money, and other resources will be needed to implement a particular requirement. This encompasses direct costs, such as financial expenditure, and indirect costs, such as the opportunity cost of allocating resources away from other projects or initiatives.

When prioritizing requirements based on cost, stakeholders can make informed decisions about which requirements will provide the most value relative to their implementation costs. This approach helps ensure that the project's budget aligns with stakeholder expectations and business objectives, ultimately contributing to more efficient use of resources and successful project outcomes.

In contrast, the other options pertain to different aspects of prioritization. Benefit focuses on the value or positive outcome a requirement brings, schedule addresses the time frame for implementation, and risk considers the potential uncertainties or challenges associated with implementing a requirement. Each of these perspectives is important, but cost specifically captures the resources involved in carrying out the requirement.