the diagram is being used to illustrate the second law of thermodynamics, where qh  represents a hot object and qcrepresents a cold object. which will  best  complete the diagram to illustrate the law? adding in the boxes an arrow that points from qh  to qcadding in the boxes an arrow that points from  qc  to  qhadding in the boxes an arrow that points in both directions between  qh  and  qcadding in each box an arrow that points upward fromqh  and from  qc