Consider the multiplexer based logic circuit shown in the figure

Which one of the following Boolean functions is realized by the circuit?

A. $${\text{F}} = {\text{W}}{\overline {\text{S}} _1}{\overline {\text{S}} _2}$$

B. $${\text{F}} = {\text{W}}{{\text{S}}_1} + {\text{W}}{{\text{S}}_2} + {{\text{S}}_1}{{\text{S}}_2}$$

C. $${\text{F}} = \overline {\text{W}} + {{\text{S}}_1} + {{\text{S}}_2}$$

D. $${\text{F}} = {\text{W}} \oplus {{\text{S}}_1} \oplus {{\text{S}}_2}$$

Answer: Option D