An early warning security fence has three major components each must perform in order for the system to perform. Their reliabilities are $\mathrm{.}4,\mathrm{.}3,$ and $\mathrm{.}2.$ The system reliability is equal to: $\mathrm{.}024\mathrm{.}076\mathrm{.}10\mathrm{.}336\mathrm{.}90$