Consider the planes \( P_{1}: 2 x+y+z+4=0 \) \( \mathrm{P} \) \( P_...

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Consider the planes \( P_{1}: 2 x+y+z+4=0 \)
\( \mathrm{P} \)
\( P_{2}: y-z+4=0 \) and \( P_{3}: 3 x+2 y+z+8=0 \)
W
Let \( L_{1}, L_{2}, L_{3} \) be the lines of intersection of the planes
\( P_{2} \) and \( P_{3}, P_{3} \) and \( P_{1} \), and \( P_{1} \) and \( P_{2} \) respectively. Then,
(a) at least two of the lines \( L_{1}, L_{2} \) and \( L_{3} \) are non-parallel
(b) at least two of the lines \( L_{1}, L_{2} \) and \( L_{3} \) are parallel
(c) the three planes intersect in a line
(d) the three planes form a triangular prism
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