System Analysis and Design
In functional decomposition, the data flow diagram

is ignored
is partitioned according to the "closeness" of the datagrams and data storage items
None of these
is partitioned according to the logical "closeness" of the actigrams
both (a) and (c)

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System Analysis and Design
A couple:

None of these
None of these
is represented by a line joining two modules
means that the upper module has the capability of calling the lower module
is a data item that moves from one module to another

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