Solubility of $\mathrm{BaF}_{2}$ in a solution of $\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}$ will be represented by the concentration term
(a) $\left[\mathrm{Ba}^{2+}\right]$
(b) $\left[\mathrm{F}^{-}\right]$
(c) $0.5[\mathrm{~F}$ ]
(d) $2\left[\mathrm{NO}_{3}^{-}\right]$