Answer:
option 2
Explanation:
given
g(x) =

the denominator cannot be zero as this would make g(x) undefined
Equating the denominator to zero and solving gives the value that x cannot be
x - 1 = 0 ⇒ x = 1 ← excluded value
the domain is { x : x ∈ R , x ≠ 1 }