It doesn't matter. According to the spec:

The file consists of one or more records separated by one or more blank lines (terminated by CR,CR/NL, or NL).

CR = Carriage Return (i.e. r)
CR/NL = Carriage Return/New Line (i.e. rn)
NL = New Line (i.e. n)

This means you can use r. n, or rn and it will work.

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