To convert an LP to standard form, which of the following statements is true? (Please check all conect answers.) D Constant terms in the objective function should be kept. C] A"? constraint should be converted to an equality constraint by subtracting an excess variable is; from its left-hand side, and adding the sign restriction e,' 2 0. [:i A"s\" constraint should be converted to an equality constraint by adding a slack variable .51 to its left-hand side, and adding the sign restriction s,- 2 0. [:i All constraints must be converted to inequality constraints. C] For an LP with m inequality constraints and n decision variables, its standard form consists of (mm) constraints and n decision variables. [3 For an LP with m inequality constraints and n decision variables, its standard form consists of m constraints and n decision variables. [3 All decision variables must be restricted to be nonnegative. C] For an LP with m inequality constraints and n decision variables, its standard form consists of m constraints and (mm) decision variables