Concept: Systematic risk is connected with relationships among different parts of a system. It occurs when one part of the system affects other parts through links and interactions.
Step 1: Understanding systematic risk.
In systematic risk, different components are connected. A disturbance in one component can spread to other components.
\[
\text{Systematic risk} \Rightarrow \text{Interconnected system risk}
\]
Step 2: Checking relationship-based attributes.
Feedback loops are related to system relationships because one action can influence another and return back as feedback.
Intertwined means closely connected.
Interactions mean different components affect each other.
Step 3: Identifying the option which is not a key relationship attribute.
Breakdowns may be a result or failure condition, but it is not a basic relationship attribute like feedback loops, interactions, and being intertwined.
Therefore, the correct answer is Breakdowns.