Only number can be used in a Document name.
File names are shown in alphabetical order in the folder structure. It is critical to also include the zero for numbers 0-9. This helps to maintain the numerical order when file names contain numbers.
Most software packages are case sensitive, so use lowercase wherever possible. Instead of using commas and underscores, use a hyphen.
So, Option "1" is the correct answer to the following question.
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