If 0 < e< 1 < f, which of the following must be true?	Choose the correct answer:
A) 1 < 1/e< 1/f
B) 1/e< 1 < 1/f
C) 1/e< 1/f< 1
D) 1/f< 1 < 1/e
E) 1/f< 1/e< 1
0&lt;e&lt;1&lt;f. Let e=1/2 and f=2   Substituting values:   A. 1&lt;2&lt;1/2 ---Wrong   B. 2&lt;1&lt; 1/2 ---Wrong   C. 2&lt;1/2&lt;1 ---Wrong   D. 1/2&lt;1&lt;2 ---Correct   E. 1/2&lt;2&lt;1 ---Wrong   Hence answer is 1/f&lt; 1 &lt; 1/e
<result>D</result>
If 0 < e< 1 < f, which of the following must be true?