All of the following statements about Integer Programming are correct except:

The time required to solve an integer program is in general much longer than the time required to solve the corresponding linear program

Rounding the solution to a linear program in order to obtain integer values will typically give a good solution to an integer programming problem

An integer program may contain a mix of integer and continuous variables

Even with the rapid increase in computing power, many integer programs of practical size remain too difficult to solve to guaranteed optimality