A) \[{{k}_{1}}+{{k}_{2}}\]
B) \[{{k}_{1}}{{k}_{2}}\]
C) \[\frac{{{k}_{1}}+{{k}_{2}}}{{{k}_{1}}{{k}_{2}}}\]
D) \[\frac{2{{k}_{1}}{{k}_{2}}}{{{k}_{1}}+{{k}_{2}}}\]
Correct Answer: D
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