challenge: What is Larry L. Peterson known for, in addition to being the Director of the PlanetLab Consortium?
  
  A. Design of the Internet Protocol and development of the BIND DNS server software
  B. Research on the HTTP protocol and development of the Apache web server
  C. Creation of the Linux operating system and development of the Git version control system
  D. Co-authoring a popular textbook on computer networks and research on the TCP Vegas congestion control algorithm
  Answer: 