Final answer:
The expression √-12 is equivalent to 5i√3.
Step-by-step explanation:
The expression √-12 can be simplified as follows:
√-12 = √(12) * √(-1)
Since the square root of a positive number is always positive, we can ignore the positive square root of 12.
Therefore, the expression √-12 is equivalent to 5i√3, which is not one of the given choices. So the correct answer is None of the above.