What does the following command line signify? prog1|prog2

Question:What does the following command line signify? prog1|prog2

1.It runs prog1 first, prog2 second

2. It runs prog2 first, prog1 second

3.It runs both the programs, pipes output of prog1 to input of prog2

4.It runs both the programs, pipes output of prog2 to input of prog1


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