Let f(x)=x+1f(x) = \sqrt{x+1}f(x)=x+1 and g(x)=x2−1g(x) = x^2 - 1g(x)=x2−1. What is the domain of (f∘g)(x)(f \circ g)(x)(f∘g)(x)?
x≥0x \ge 0x≥0
x≥1x \ge 1x≥1 or x≤−1x \le -1x≤−1
x≥−1x \ge -1x≥−1
all real numbers