Which of the following represents the isotopes of the fictitious element nevadium (Nv) with their respective abundances?
a) Nv-10: 20%, Nv-11: 35%, Nv-12: 45%
b) Nv-10: 45%, Nv-11: 35%, Nv-12: 20%
c) Nv-10: 35%, Nv-11: 45%, Nv-12: 20%
d) Nv-10: 20%, Nv-11: 45%, Nv-12: 35%