A parent nucleus X X\,X undergoes a decay chain consisting of exactly one α \alpha\,α decay and two β−\beta^-β− decays to form a daughter nucleus YYY. Let Z Z\,Z and A A\,A represent the atomic number and mass number, respectively. Which statement correctly describes the relationship between the parent nucleus X X\,X and the daughter nucleus YYY?
YYY is an isotope of XXX with ZY=ZXZ_Y = Z_XZY=ZX and AY=AX−4A_Y = A_X - 4AY=AX−4
YYY is an isobar of XXX with AY=AXA_Y = A_XAY=AX and ZY=ZX−2Z_Y = Z_X - 2ZY=ZX−2
YYY is an isotone of XXX with AY−ZY=AX−ZXA_Y - Z_Y = A_X - Z_XAY−ZY=AX−ZX
YYY is an isotope of XXX with ZY=ZXZ_Y = Z_XZY=ZX and AY=AX−2A_Y = A_X - 2AY=AX−2