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

If f(x) \(= \frac{{\sqrt {x - 1} }}{{x - 4}}\) defines a function on

1.	If f(x) \(= \frac{{\sqrt {x - 1} }}{{x - 4}}\) defines a function on R, then what is its domain?
A.	(-∞, 4) ∪ (4, ∞)
B.	(4, ∞)
C.	(1, 4) ∪ (4, ∞)
D.	[1, 4) ∪ (4, ∞)
Answer» E.

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