A) \[\sqrt{{{p}^{2}}+{{q}^{2}}+{{r}^{2}}}\]
B) \[\sqrt{{{p}^{2}}-{{q}^{2}}+{{r}^{2}}}\]
C) \[\sqrt{{{p}^{2}}+{{q}^{2}}}\]
D) r
E) None of these
Correct Answer: D
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