System Analysis and Design
The systems conversion technique of totally removing the existing system and immediately implementing the new system is called as

parallel run
crash conversion
phased conversion
pilot conversion
None of these

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System Analysis and Design
A square symbols

identifies data flow
defines a source or destination of system data
is a data store-data at rest, or a temporary repository of data
represents a process that transforms incoming data flow(s) into outgoing data flows
None of these

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