According to the PMBOK® Guide and The Standard for Portfolio Management, the relationship between portfolios, programs, and projects is defined by their focus on strategic objectives versus tactical execution.

Portfolio Management: A portfolio is defined as a collection of projects, programs, subsidiary portfolios, and operations managed as a group to achieve strategic objectives. The primary focus of portfolio management is to ensure that the organization is investing in the " right " work—those initiatives that align with the organizational strategy and provide the most value. It involves prioritizing, authorizing, and managing the mix of components to optimize the overall return.

Program Management: Focuses on the interdependencies between projects and the coordination of related projects to achieve benefits that would not be available if the projects were managed individually.

Project Management: Focuses on the " right way " to do the work. It is concerned with meeting specific project objectives, such as scope, schedule, budget, and quality.

Analysis of other options:

Option B: This is incorrect because project management is a subset of portfolios and programs; it does not focus on managing them.

Option C: Program management focuses on managing a group of related projects, not portfolios.

Option D: Using the word " specific " is less accurate than the term " right. " In PMI terminology, the " right " work refers to strategic alignment, which is the hallmark of portfolio management.

Per PMI standards, while projects and programs focus on execution and delivery (doing things right), portfolio management is the strategic layer that ensures the organization is focused on the correct initiatives (doing the right things) to meet business goals.