Take a look at the following letter written by abraham lincoln. what indicates that it is a primary source?

a letter written by abraham lincoln in 1854

the letter is dated.
it is a handwritten document.
the letter looks old.
abraham lincoln was the president in 1854.

If this question has multiple answers, it'd be that the letter is dated and it is a handwritten document. If it's multiple choice. I'd say, logically, it'd be a handwritten document because anyone can put a date on a paper but it's very difficult to recreate someone's handwriting. Also, considering it was in 1854, they used feather pens and ink.

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