Evaluate the Radical Expression If It Is a Real Number $$\sqrt [ 4 ] { - \frac { 1 } { 81 } }$$

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.
- $$\sqrt [ 4 ] { - \frac { 1 } { 81 } }$$

A) $\frac { 1 } { 3 }$
B) 19
C) $- \frac { 1 } { 3 }$
D) not a real number