In a boron sample, aluminium is the sole impurity. The mass spectrum of the mixture has three peaks, which come from three ions, $X^+$, $Y^+$ and $Z^+$, with these results: $m/e$: $X^+ = 10$, $Y^+ = 11$, $Z^+ = 27$ Percentage abundance: $X^+ = 15.52$, $Y^+ = 74.48$, $Z^+ = 10.00$ Which of the following statements are true?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct