KIMP is related to PNRU in a certain way based on the English alphabetical order. In the same way, QOSV is related to VTXA. To which of the following is CAEH related, following the same logic?

Each letter in the word CAUSEYS is changed to the letter immediately following it in the English alphabetical order, and then all the letters thus formed are arranged in alphabetical order. Which of the following letters will be fourth from the right in the new group of letters thus formed?

In a certain code language, 'POUR' is coded as '5719' and 'UNIT' is coded as '2478'. What is the code for 'U' in the given code language?