Laboratory Report Cover SheetDeVry University College of Engineering and Information SciencesCourse Number: ECET-230Professor: Laboratory Number: 3Laboratory Title:Designing Adders and SubtractorsSubmittal Date:Click here to enter a date.Objectives: To build a functioning 4-bit adder/subtractor and to build a functioning 8 operation arithmetic and logic unit (ALU)1) For 4-bit 8-function ALU to implement the operationsObservations/Measurements:Describe any problems you had with this weeks assignment.Questions:1. In the simulation run of the four-bit adder when we performed the additions 2 + 4 and 3 + 6 we did not immediately have an output of 6 and 9 respectively on SOUT. What could be the cause of this?2. If we changed the count period to 100nS for AI and BI would this correct the anomalies in Question 1? Why or why not?1. How fast can your 4-bit adder/subtractor determine the sum or difference of two numbers?