A) \[\varepsilon \,\,=\,\,\frac{Increase\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Loss\,\,of\,\,availability\,\,of\,\,the\,\,system}\]
B) \[\varepsilon \,\,=\,\,\frac{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}\]
C) \[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}\]
D) \[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,system}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}\]
Correct Answer: B
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