In the **first octant** (octant I), the signs of $(x, y, z)$ are:
A$(-, -, -)$
B$(-, +, +)$
C$(+, -, +)$
D$(+, +, +)$
Answer & Solution
Correct answer: D. $(+, +, +)$
Octant I: all coordinates positive: $(+, +, +)$.
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