What is the output when the following shell command executes?

What is the output when the following shell command executes?

$ cat << foobar
Hello foobar
foobar

What is the output when the following shell command executes?

$ cat << foobar
Hello foobar
foobar

A.
The contents of the file foobar

B.
Hello

C.
No output but a file named foobar is created

D.
Hello foobar

E.
Hello foobar
foobar



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