Which of the following does list all the true statements below?

I. The Internet Engineering Task Force $($IETF$),$ founded in $1986,$ is the premier standards development organization $($SDO$)$ for the Internet.$$

II$.$ IETF's mission is to produce high quality, relevant technical and engineering documents that influence the way people design, use, and manage the Internet in such a way as to make the Internet work better.

III. RFC is short for Request for Comments. RFC documents contain technical specifications and organizational notes for the Internet.$$

IV$.$ The RFC Series includes documents produced by the IETF, the Internet Architecture Board $($IAB$),$ the Internet Research Task Force $($IRTF$),$ and independent submitters