Which of the operators below are second order linear operators? A$.()=+2+2$L$($y$)=$y$+2$y$+2$y B$.()=+2+2$L$($y$)=$y$+2$y$+$y$2$ C$.()=+2+2$L$($y$)=$y$+2$y$+2$eyt D$.()=+4$L$($y$)=$y$+4$y E$.()=+2+2+$L$($y$)=$y$+2$y$+2$y$+$t F$.()=+3$L$($y$)=$y$+3$y G$.()=+2+2$L$($y$)=$y$+2$ty$+2$ety H$.()=$L$($y$)=$y$$ I. None of the Above Note: Select all that applies.