.2.2 4-bit Ripple Carry Adder: Use the symbol in Figure 2.2.1(a) for 1-bit full adder, and indicate how you would interconnect four of such adders in order to build a 4-bit ripple carry adder for which a symbol is provided in Figure 2.2.1(b). al x(3:0) y(3:0) cout cout cin cin s(3:0) sum a) b) Figure 2.2 1-bit full adder symbol, (b) 4-bit ripple carry adder symbol