The geometry around Cu and its spin state for $\mathrm{K}_{3}\mathrm{CuF}_{6}$ and $\mathrm{KCuL}_{2}$, [$\mathrm{H}_{2}\mathrm{L}=\mathrm{H}_{2}\mathrm{NCONHCONH}_{2}$], respectively are:
(a)(octahedral, high-spin) and (square planar, low-spin)
(b)(octahedral, low-spin) and (square planar, low-spin)
(c)(trigonal prismatic, high-spin) and (tetrahedral, high-spin)
(d)(trigonal prismatic, low-spin) and (tetrahedral, high-spin)