A) $ |z_1+z_2|\le |z_1|+|z_2| $
B) $ |z_1+z_2|\ge |z_1|+|z_2| $
C) $ |z_1 - z_2| \leq ||z_1| - |z_2|| $
D) $ |z_1+z_2|\ge | |z_1|-|z_2| | $
Correct Answer: D
It is a fundamental concept.
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