In a data flow diagram (DFD),a black hole is a process that has _____.

In a data flow diagram (DFD),a black hole is a process that has _____.
A) no input
B) at least one output and one input,but the output obviously is insufficient to generate the input shown
C) no output
D) at least one input and one output,but the input obviously is insufficient to generate the output shown


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