Mathematics Relations and Functions Domain of a Function

If f(x) \(= \frac{{\sqrt {x - 1} }}{{x - 4}}\) defines a function on R, then what is its domain?

1

(-∞, 4) ∪ (4, ∞)

2

(4, ∞)

3

(1, 4) ∪ (4, ∞)

4

[1, 4) ∪ (4, ∞)

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