A) Layer 1 device
B) central device
C) Dumb device
D) Ail of the above
E) None of these
Correct Answer: D
Solution :
In computing, echo is a command in DOS. OS/2. MS-windows. UNIX that places a string on the computer terminal. It is typically used in shell scriptes and batches files to output status text to the screen or a file.You need to login to perform this action.
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