sort without common values and ignoring case in Linux

Question 1:
Sort the contents of the /home/bob/values.conf file alphabetically and eliminate any common values. Save the sorted output in the /home/bob/values.sort file.

Answer 1:

sort -u /home/bob/values.conf > /home/bob/values.sort

Question 2:
Sort again the contents of the /home/bob/values.conf file alphabetically. Eliminate any common values and ignore case.

Finally, save the sorted output in the /home/bob/values.sorted file.

Answer 2:

sort -fu /home/bob/values.conf > /home/bob/values.sorted