A rectangular prism is completely packed with 180 cubes of edge length fraction 1/3 inch, without any gap or overlap. Which of the following describes the volume of this rectangular prism? 19 unit cubes and 9 smaller cubes of volume fraction 1/27 cubic inch each 19 unit cubes and 27 smaller cubes of volume fraction 1/27 cubic inch each 6 unit cubes and 6 smaller cubes of volume fraction 1/27 cubic inch each 6 unit cubes and 18 smaller cubes of volume fraction 1/27 cubic inch each

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