2. (30 POINTS) Implement the following functions using a single 16 x3 ROM. Use dot notation to indicate the ROM contents. (10 POINTS each) X = AB + BCD+AB Y=AB + BD Z=A+B+C+D 3. (10 POINTS- 5 POINTS each) Specify the size of a ROM that you could use to program each of the following combinational circuits. Please show your work. 3.A.) A 16-bit adder/subtractor with Cin and Cout 3.B.) An 8 x 8 multiplier