Violation
Effective tissue displacement with elastic impression materials can be accomplished by 1. injection of the material into the gingival sulcus. 2. placement of chemical-impregnated cords into the gingival sulcus. 3. electrosurgical means. 4. a firm tray material.
(2) and (4)
All of the above
(1) (2) (3)
(1) and (3)
(4) only