Which of these is the correct method for appending “foo” in /tmp/bar file?

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Question:Which of these is the correct method for appending “foo” in /tmp/bar file?

1.echo foo > /tmp/bar

2.echo foo >> /tmp/bar

3.echo foo | /tmp/var

4./tmp/bar < echo foo

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  1. Which of these is the correct method for appending “foo” in /tmp/bar file?
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