Under which one of the following conditions will the two planes x + y + z = 7 and αx + βy + γz = 3, be parallel (but not coincident)?

1
α = β = γ  = 1 only
2
α = β = γ  = \(\frac{3}{7}\)1 only
3
α = β = γ  
4
None of the above

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