Suppose you have three identical prisms with congruent equilateral triangles as the end-polygons. Suppose you attach them by the rectangular faces so they are perfectly aligned. There will be some large faces created by two or more co-planar faces of the individual prisms: count each such large face as one. Given that, how many faces does the resultant solid have	Choose the correct choice from the following:	A) 4	B) 6	C) 9	D) 5	E) 12
To arrange them as described I did as follows on my scratch paper (see the file attached), where I counted 4 sides and added top , hence  4+1= 
<gadget id="calculator"> 4+1</gadget>
<output>5</output>
5.   5
<result>D</result>
Suppose you have three identical prisms with congruent equilateral triangles as the end-polygons. Suppose you attach them by the rectangular faces so they are perfectly aligned. There will be some large faces created by two or more co-planar faces of the individual prisms: count each such large face as one. Given that, how many faces does the resultant solid have