A) \[{{\eta }_{n}}={{\eta }_{b}}={{\eta }_{s}}\]
B) \[{{\eta }_{b}}={{\eta }_{s}}{{\eta }_{n}}\]
C) \[{{\eta }_{s}}\times {{\eta }_{n}}\times {{\eta }_{s}}=1\]
D) \[{{\eta }_{s}}={{\eta }_{s}}{{\eta }_{n}}\]
Correct Answer: D
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