challenge: Who were the founders of Maps.me?
  
  A. Alexander Borsuk, Yury Melnichek, Alexander, Viktor Govako, and Siarhei Rachytski
  B. Yury Melnichek, Viktor Govako, and Siarhei Rachytski
  C. Yury Melnichek, Alexander Borsuk, Viktor Govako, Siarhei Rachytski, and one anonymous founder
  D. Yury Melnichek, Alexander Borsuk, Viktor Govako, and Siarhei Rachytski
  Answer: 