code class$=$"asciimath"$>$The range of the function f$($x$,$y$)=5+$x$^(2)+2$y$^(2)$ is a$.[5,\backslash$infty $)$ b$.[8,\backslash$infty $)$ c$.(0,\backslash$infty $)$ d$.[2,\backslash$infty $)$ e$.(-\backslash$infty $,\backslash$infty $)$