If f(x)=x−1f(x) = \sqrt{x-1}f(x)=x−1, what is the domain of f(x)f(x)f(x)?
x>1x > 1x>1
x≥1x \geq 1x≥1
x≥0x \geq 0x≥0
x∈Rx \in \mathbb{R}x∈R