Task: Question Answering
Input (English): Question: The operation T is defined by x T y=1/x+1/y for all nonzero numbers x and y. If z is a number greater than 1, which of the following must be true.
I. x T (-z)=0
II. z T z/z-1=z
III. 2/z T 2/z=1

 Option A: a.

 Option B: b.

 Option C: c

 Option D: d

 Option E: e
Output (English): Option E