QUESTION 4 To convert an LP to standard form, which of the following statements is true? (Please check all correct answers.) For an LP with me quality constraints and a decision variablen, its standard form consists of constraints and (mun) decision variables. All decision variables must be restricted to be nonnegative Constant terms in the objective function should be dropped from the model For an LP with m equality constraints and decision variables, its standard form consists of m constraints and decision variables, A's constraint should be converted to an equality constraint by subtracting an excess variable o from its left-hand side, and adding the sign restriction ej 20 A constraint should be converted to an equality constraint by adding a slack variable s to its left-hand side, and adding the sign restriction 50 All constraints must be converted to equality constraints For an LP with m equality constraints and n decision variables, its standard form consists of (men) constraints and n decision variables. a