Write relational algebra queries for the following. You can (and should) write your queries on multiple lines, if appropriate, using the renaming operator. a. Find the names of any player with an Elo rating of 2850 or higher. Find the names of any player who has ever played a game as white. b. Find the names of any player who has ever won a game as white. Find the names of any player who played any games in 2018. c. Find the names and dates of any event in which Magnus Carlsen lost a game. d. Find the names of all opponents of Magnus Carlsen. An opponent is someone who he has played a game against. Hint: Both Magnus and his opponents could play as white or black. Find the names of all players who have never lost a game (a draw is not considered a loss).