The source document states, (S) The exercise will begin on 4 May and end on 25 May (U) Elements of this unit will participate in the exercise (U) Unit members participating will be Barkley and James The Security Classification Guide (SCG) states: (U) Which unit will participate in the exercise (S) Exercise dates (U) Participating members of the unit The new document states: (S) Barkley and James cannot attend training during the exercise. They must attend before 4 May or after 25 May. Identify the concept used to determine the derivative classification of the new document. (Select the best answer) Directed by Contained in Classification by compilation Revealed by