$1.$ The Boolean function

Y $=$X$2($X$1$X$3+$X$1$ X$3)+$X$1$X$2$

is to be implemented with a pass gate whose switch tree is shown in Fig$\mathrm{.}5\mathrm{.}6.$ Which of the following combinations is correct for input variables A$,$ B$,$ C$,$ and D$?$