Bailey’s Cakes and Pastries baked a three-tiered cake for a wedding. The bottom tier is a rectangular prism that is 18 centimeters long, 12 centimeters wide, and 8 centimeters tall. The middle tier is a rectangular prism that is 12 centimeters long, 8 centimeters wide, and 6 centimeters tall. The top tier is a cube with edges of 4 centimeters each. What is the volume of each tier and of the entire cake?     
1,728 cubic centimeters
2,368 cubic centimeters 
2,664 cubic centimeters 
64 cubic centimeters
576 cubic centimeters 
38 cubic centimeter                
16 cubic centimeters                                           
The top tier 
The middle tier
The bottom tier
The entire tier