单项选择题

What is the output when the following shell script 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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What is the output when the following shell script executes？（） cat<；<；foobar Hello foobar foobar

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What is the output when the following shell script executes？（）
cat<；<；foobar
Hello foobar
foobar