single artboard Save as PDF

[#1]

Hi,
I have created 12 artboards. I selected artboard 1 and save the file as PDF. But I noticed the file size is huge. So I opended the PDF file in Illustrator. Instead of Artboard 1 only it is showing all aertboards. 
So I have to delete the other artbords and save the PDF. 
Is there any solution to save the PDF of selected artboard. If I open the saved PDF in Illlustrator there should be single artboard.....

Please help!

[#2]

Hi,
I have created 12 artboards. I selected artboard 1 and save the file as PDF. But I noticed the file size is huge. So I opended the PDF file in Illustrator. Instead of Artboard 1 only it is showing all aertboards. 
So I have to delete the other artbords and save the PDF. 
Is there any solution to save the PDF of selected artboard. If I open the saved PDF in Illlustrator there should be single artboard.....

Please help!

[#3]

Currently, you can't specify one (or more) particular artboard(s) when saving as...

It has been lodged as a feature request: https://illustrator.uservoice.com/forums/601447-illustrator-desktop-bugs/suggestions/31938694-save-a...

Contrary to what that feature request states, you can do what you want with the Save A Copy function.