Implement the function 𝐟(𝒂,𝒃,𝒄,𝒅)=∑(𝟎,𝟏,𝟓,𝟔,𝟕,𝟗,𝟏𝟎,𝟏𝟓) using 8:1 and 4:1 mux

Implement the function 𝐟(𝒂,𝒃,𝒄,𝒅)=∑(𝟎,𝟏,𝟓,𝟔,𝟕,𝟗,𝟏𝟎,𝟏𝟓) using
8:1 MUX with a, b, c as select lines
4:1 MUX with a, b as select lines