An LP formulation must have at least one constraint but no limit on the number of objective functions. T/F Hiring cost and firing cost do not occur simultaneously in the same period. T/F An LP constraint does not have a right hand side. T/F An MPS schedule does not use the lead time information. T/F An MPS is frozen in the period between the demand fence and the planning fence. T/F Following a rolling horizon method for MPS means to keep the planning horizon constant for each planning iteration. T/F There is no restriction of changes in MPS prior to the planning fence. T/F