Question: In a Data Flow Diagram ( DFD ) , what does a double line between a process and a data store signify? Group of answer

In a Data Flow Diagram (DFD), what does a double line between a process and a data store signify?
Group of answer choices
A high-priority process
A bi-directional data flow
An error in the diagram
A read-and-write operation
What does a sharp rectangle symbol (unsealed) represent in a Data Flow Diagram (DFD)?
Group of answer choices
Data store
Process
External entity
Data flow

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