What is the domain of the function f(x) = √(x - 3) / (x - 5)?

✓ Correct Answer: Option A

For the square root, x - 3 ≥ 0, so x ≥ 3. For the denominator, x - 5 ≠ 0, so x ≠ 5. Combining these, the domain is all x such that x ≥ 3 and x ≠ 5, which is [3, 5) U (5, ∞).