<prompt> Which of the following type of GIC is used as a base?Type IType IIaType IIbType III  <response>: Type I: Luting crowns, bridges and orthodontic brackets.Type IIa: Esthetic restorative cements.Type IIb: Reinforced restorative cements.Type III: Lining cements, base.Ref: Phillips Science of Dental Materials ed 12 pg 320 