According to the PMBOK® Guide, specifically in the foundational sections regarding the " Context of Project Management, " the guide explicitly defines the interrelationships between Project, Program, and Portfolio Management.

Interrelationship Framework: The PMBOK® Guide serves as the foundational standard that identifies how project management integrates into the broader organizational hierarchy. It explains that:

Portfolios are a collection of projects, programs, subportfolios, and operations managed as a group to achieve strategic objectives.

Programs are grouped within a portfolio and comprise subprograms, projects, or other work that are managed in a coordinated fashion to support the program.

Individual Projects (whether in or out of a program) are focused on achieving specific deliverables that contribute to the higher-level goals of the program or portfolio.

Organizational Context: The PMBOK® Guide describes how project management aligns with Organizational Project Management (OPM), which provides a strategic framework to integrate these disciplines to deliver better business value.

Analysis of Other Options:

A. Program Management Body of Knowledge Guide: This is not the official title of the PMI standard; the correct title is " The Standard for Program Management. "

B. The Standard for Program Management: While this standard discusses programs and their projects, the PMBOK® Guide is the primary reference that establishes the baseline definitions and interrelationships for the entire profession.

C. OPM3®: This is a maturity model used to assess an organization ' s capability to implement its strategy through project, program, and portfolio management, rather than being the primary document defining the functional interrelationships of the disciplines themselves.