The graph of a function `f` is obtained from the graph of the function `g` with rule `g(x) = sqrt (2x - 5)` by a reflection in the `x`-axis followed by a dilation from the `y`-axis by a factor of `1/2`.
Which one of the following is the rule for the function `f`?
- `f(x) = sqrt (5 - 4x)`
- `f(x) = - sqrt (x - 5)`
- `f(x) = sqrt (x + 5)`
- `f(x) = −sqrt (4x - 5)`
- `f(x) = −sqrt (4x - 10)`