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A regular triangular pyramid is cut by 2...

A regular triangular pyramid is cut by 2 planes which are parallel to its base. The planes trisects the altitude of the pyramid. Volume of top, middle and bottom part is `V_1, `V_2` and `V_3` respectively. What is the value of `V_1: V_2: V_3`?
एक सम त्रिभुजाकार पिरामिड को दो तल जो उसके आधार के समांतर है, द्वारा काया जाता है। तल पिरामिड की ऊँचाई को समत्रिभाजित करते है उसके ऊपरी, मध्य तथा निचले भाग का आयतन क्रमशः `V_1, `V_2 तथा `V_3` है। `V_1: V_2: V_3` का मान क्या है?

A

A)`1: 8:27`

B

B)`1:8:19`

C

C)`2:9:27`

D

D)`1:7:19`

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