A) \[4{{p}^{2}}+\frac{1}{4}{{q}^{2}}+{{r}^{2}}-2pq-2qr+4pr\]
B) \[2{{p}^{2}}+\frac{1}{4}{{q}^{2}}+{{r}^{2}}-2pq-2qr+4pr\]
C) \[4{{p}^{2}}+\frac{1}{4}{{q}^{2}}+{{r}^{2}}-2pq+qr+4pr\]
D) \[4{{p}^{2}}+\frac{1}{4}{{q}^{2}}+{{r}^{2}}-2pq-qr+4pr\]
E) None of these
Correct Answer: D
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