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

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

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System Analysis and Design
A couple:

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

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