action: In Power Automate, an action is the operation that the flow performs after a trigger or condition is met. Sending an outbound text (SMS or notification) is a discrete task performed by a connector, categorizing it as an action.

condition: A condition is a logic gate that evaluates a statement as true or false. Testing if there are specifically nine customers involves a comparison (e.g., Count is equal to 9), which defines a condition block.

expression: Expressions are used to perform calculations, manipulate data, or retrieve specific values. Determining the number of customers (the count) typically requires an expression (such as the length() function) to evaluate a collection of data.

Microsoft Learn: "Get started with expressions in Power Automate." This documentation defines expressions as functions used to manipulate data or perform calculations within a flow.

Microsoft Learn: "Add a condition to a cloud flow." This guide explains that conditions are used to execute different actions based on whether a specific logic test (like a count threshold) is met.

Microsoft Learn: "Common Data Service (Dataverse) connector - Actions." Lists "Send an email" or "Create a record" as actions, which applies to "outbound text" functionality.

Microsoft Power Platform Fundamentals (PL-900): Official curriculum, Module "Introduction to Power Automate," Section: "Flow control elements."