What document outlines a business idea, aims, and objectives, along with the four business functions?

The correct answer is the business plan, which serves as a comprehensive document outlining a business idea, its aims and objectives, and the essential elements that make a business viable. A business plan is crucial for both new ventures and established businesses when looking to implement changes or raise funds. It typically includes the business's mission statement, market analysis, organizational structure, details about products or services, strategies for marketing and sales, funding requirements, and financial projections.

Beyond just summarizing the business idea, the business plan also addresses the four key business functions: human resources, marketing, operations, and finance. By doing so, it provides a holistic view of how the business plans to operate and grow in the competitive environment.

Other options, while related to aspects of business planning, do not encompass the full range of information contained within a business plan. For example, a marketing plan focuses specifically on marketing strategies and tactics, whereas an operational plan outlines day-to-day operations but lacks a comprehensive overview of the business's strategic goals. A business case is designed to justify a particular project or investment, which is narrower in focus compared to the broader and more detailed perspective found in a business plan.