Evaluate the Radical Expression If It Is a Real Number $$\sqrt [ 4 ] { - 81 }$$

Multiple Choice

Evaluate the radical expression if it is a real number. Use a calculator to approximate irrational numbers to the nearest
hundredth. If the expression is not a real number, so state.
- $$\sqrt [ 4 ] { - 81 }$$

A) -3
B) -36
C) -12
D) not a real number