Elance Exams Answers PDF file

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What is the main difference between ref and out parameters when being passed to a method?

Variables marked with "out" keyword cannot be readonly whereas "ref" variables can be.
Variables marked with "ref" keyword cannot be readonly whereas "out" variables can be.
"ref" parameters don't have to be initialised before passing to a method, whereas "out" parameters do.
They are both same in every sense of the word.
"out" parameters don't have to be initialised before passing to a method, whereas "ref" parameters do.
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