The geometry around $\mathrm{Cu}$ and its spin state for $\mathrm{K_3CuF_6}$ and $\mathrm{KCuL_2}$, [$\mathrm{H_2L = H_2NCONHCONH_2}$], 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)