3. Five administrative clerks are available to perform four clerical tasks. The time, in minutes, for each clerk to perform each job is given in the following table. The goal is to assign clerks to jobs to minimize the total time required to perform the four jobs. Because of union rules, each clerk can do only 1 job. a) [ 8 marks] Solve using the Branch and Bound Algorithm. State the details of your formulation. b) [ 8 marks] Solve the same problem using a Network Programming formulation and solve it using a tool such as LINDO