The answers are correct. Char is used in i18n/l10n, I think if you look at Input/OutputStreamWriter, you will understand why char is the right answer. String is obvious answer, examples are salutations, messages ....
Mei, I am not able to get same link on Sun site. It has only 9 sample question; i have print out of that and if u r interested to have that I can send scaned copy of that on your e-mail id on Monday. regards.