If x = 5 y=4 z=3 then which of the following is true? (I) x+y+z = 11 (II) x+y-z = -6 (III) x+Y+z = 12 (IV) -x+y-z = -4

1. A Option A: I and II
2. B Option B: III and IV
3. C Option C: all
4. D Option D: none

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