Which of the Following Statements About Isotopes Is/are Correct

Which of the following statements about isotopes is/are correct?
i.They have different masses
ii.They have different numbers of neutrons
iii.They have different electrical charges
iv.They have different nuclear symbols
v.They have different mass numbers

A) i and ii
B) i, ii, and iv
C) i, ii, and v
D) i, ii, iv, and v
E) All are correct