What is a pipe?

A pipe is a development tool used for POSIX standard compliance coercement.

A pipe is an inter$-$process communication $($IPC$)$ mechanism that allows for full$-$dupex $($i$.$e$.$ bi$-$directional$)$ communication between two or more processes.

None of these

A pipe is an inter$-$process communication $($IPC$)$ mechanism that allows for half$-$dupex $($i$.$e$.$ uni$-$directional$)$ communication between two processe