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If x^a = yb = z^c and y^2 = zx, then 1/a...

If `x^a = yb = z^c` and `y^2 = zx`, then `1/a + 1/c` is equal to -

A

`1/y`

B

`-1/y`

C

`2/y`

D

`-2/y`

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