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What is the correct answer?
4
A. (ΣV)2 + (ΣH)2
B. √[(ΣV)2 + (ΣH)2]
C. (ΣV)2 +(ΣH)2 +2(ΣV)(ΣH)
D. √[(ΣV)2 +(ΣH)2 +2(ΣV)(ΣH)]