The Internet Engineering Task Force (IETF) is a collaborative effort (nonprofit) by the international community of Internet professionals to improve the design, use, and management of the Internet. Which international organization charters the activity of IETF?

A.
IANA (Internet Assigned Numbers Authority)

B.
ISO (International Organization for Standardization)

C.
ISOC (Internet Society)

D.
RIR (Regional Internet Registry)

E.
IEC (International Electrotechnical Commission)