Find c such that the function f$($x$)=$ ce$-(0\mathrm{.}210$x$+0\mathrm{.}42)$ is a valid probability distribution over the range x$>0\mathrm{.}594.$ Select one: a$.2\mathrm{.}20750748$ b$.0\mathrm{.}33402222$ c$.2\mathrm{.}77308395$ d$.1\mathrm{.}02415107$ e$.0\mathrm{.}36207361$