Assuming that foo and bar are existing programs, what is the meaning of the shell command below?

foo $|$ bar

Assuming that foo and bar are existing programs, what is the meaning of the shell command below?

foo $|$ bar

The shell will execute foo, and then execute bar once foo has completed

The shell will execute foo, and then execute bar once foo has completed successfully

The shell will execute foo and bar concurrently, with data written by bar to its standard output becoming available to foo on its standard input

The shell will execute foo and bar concurrently, with data written by foo to its standard output becoming available to bar on its standard input

All of the above

None of the above

I don't know