5.A posterior palatal seal is added to a maxillary complete denture in order to:1) increase the denture base area;2) maintain the sealing along the junction of the hard and soft palate;3) achieve the peripheral seal;4) enhance retention of the denture on the bearing area;5) prevent food accumulation under the denture base;6,) decrease the gag reflex;7) compensate for polymerization shrinkage;8) decrease the palatal denture base area.The correct answer is: