you would interconnect four of such adders in order to build a 4-bit ripple ca symbol is provided in Figure 2.2.1(b). t Ripple Carry Adder: Use the symbol in Figure 2.2.1(a) for 1-bit full adder, and indicate how rry adder for which a x(3:0) y(3:0) cout cin cout cin s(3:0) sum a) b) Figure 2.2.1 (a) 1-bit full adder symbol, (b) 4-bit ripple carry adder symbol 2.2.4 HEX Decoder: Use combinational logic design principles to design a 7-Segment Display decoding logic such that when a number is entered between 0 and 15, the number will show up in hex representation on the display HEXO./For example, when the user enters 1, two of the vertically aligned 7-Segment Display LEDs should light up. Similarly number 2 should light up five of the LEDs. Please optimize your logic as much as possible to yield the lowest cost i.e. lowest number of input switches, gates, literals, and gate inputs. Input-to-Output delay is not a concern in this application. Hint: Remember the 7-Segment Display on DEO board is characterized by 8 independent active low outputs (including the dot in the lower right) that need to be all defined to determine the displayed character, as depicted in Table 2.2.1