In Salesforce Flow, variables are dynamic resources used to store values that can change during the execution of the flow. You can assign and reassign values to variables using Assignment elements.
A. Text Template: Static content used for emails, messages, or display — it cannot change mid-flow.
B. Formula: Computed value based on current context — recalculated, but not "changed" directly.
C. Stage: Not a resource type in Flow; possibly referring to flow screen stage or Opportunity stage.
D. Variable: ✅ Correct. The only flow resource that you can update during flow execution.
Reference Extracts from Salesforce Help Documentation on Flow Resources:
“A variable is a resource that stores values that can change as the flow runs.”
“Other resources like text templates and formulas are static or calculated at runtime.”
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