Final answer:
Option 4, which includes Time / Management / Stakeholders, is not expressed in the Project Management Triangle, as the triangle traditionally includes Time, Cost, and Scope as its main elements.
Step-by-step explanation:
The Project Management Triangle, also known as the Triple Constraint, refers to the three main constraints that project managers consider when balancing a project's competing demands. These constraints are Time, Cost, and Scope. The correct options that express the elements of the Project Management Triangle are 1.Time / Cost / Scope and 2.Time / Cost / Quality.
Quality is often considered alongside the triangle as an additional constraint that interacts with the other three. However, it's not traditionally a corner of the triangle. The option that is not expressed in the Project Management Triangle is '4.Time / Management / Stakeholders'. This is because, while management and stakeholders play a significant role in project management, they are not part of the foundational constraints embodied by the triangle.