12. (10 Points) Consider the two level (AND-OR) function ia, b,c, d)- abe+cd' and two level (OR-AND) function ffa,b,c,d) = (a,+ b+c)(a + c' + d) find the following two level circuits expressions for fi and 2. (Hint: use both SOP and POS form of fi and ) (a) (2 Points) NAND-NAND for J (b) (3 Points) NOR-NOR for f (c)(2 Points) NAND-NAND for 2 (d) (3 Points) NOR-NOR for