challenge: What was Daala presented as to the IETF on March 24, 2015?
  
  A. A candidate for their Internet Video Codec (NETVC) video standard
  B. A candidate for their Internet Image Codec (NETIC) image standard
  C. A candidate for their Internet Data Codec (NETDC) data standard
  D. A candidate for their Internet Audio Codec (NETAC) audio standard
  Answer: 