Given the statement string X = "ElephantqwerTarndf"; string S; give the C# code statements to do each of the following: a. Replace all the "e" characters with "o," and assign the result to S b. Display the character position of the first "t" after the 3rd character. c. Assign the substring between characters 3 and 8 to S. d. Insert "ain" after the last "r" and assign the result to S. e. Change all the characters to upper case, and assign the result to S. f. Display the position of the first upper case "T" in X in the console window. g. Repeat (f) using a case-insensitive search