A cuboid container is made of plastic. The length, width and height of the cuboid cavity inside are x, y and z respectively. The thickness of the six sides is 1. What's the volume of the plastic used to make this container?
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Axy+yz+xz+2(x+y+z)-4
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Bxy+yz+xz+2(x+y+z)+4
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C2xy+2yz+2xz+4(x+y+z)
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D2xy+2yz+2xz+4(x+y+z)-8
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E2xy+2yz+2xz+4(x+y+z)+8
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正确答案: E