it's a digital logic design question. Please solve this clearly and explain everything. Thanks!

21. For the logic function, f(x1,x2,x3)=M(1,4,5,9,11,13,14) (a) Write the Boolean expression for the above logic function in SOP form (do not minimize) and Draw the logic circuit using only NAND gates (b) Write the Boolean expression for the above logic function in POS form (do not minimize) and Draw the logic circuit using only NAND gates 21. For the logic function, f(x1,x2,x3)=M(1,4,5,9,11,13,14) (a) Write the Boolean expression for the above logic function in SOP form (do not minimize) and Draw the logic circuit using only NAND gates (b) Write the Boolean expression for the above logic function in POS form (do not minimize) and Draw the logic circuit using only NAND gates