[scribus] Which PDF?

[wena-parry at talktalk.net]

Which of the three choices would be correct  to send a file to LS
>
> PDF 1.3 (Acorbat4)
> PDF 1.4 (Acrobat5)
> PDF 1.5 (Acrobat 6)
>
> When I open any one of them and get to the above choices when I look 
in the
pre Press tab. And all three declares that the output is PDFX  3 but 
the
information about CMYK is greyed out.
>
> So what am I to do?

Maybe I should have said that all the content in this book is black and 
white.