System Analysis and Design
Pointers are useful in

Traversing a linked list
All of these
Locating a particular sector of a magnetic disk
Pointing mistakes in input data
None of these

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System Analysis and Design
An open rectangle

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

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