Simplify and Write with Positive Exponents Only $3 ^ { 3 } \cdot 3 ^ { - 4 }$

Multiple Choice

Simplify and write with positive exponents only.
- $3 ^ { 3 } \cdot 3 ^ { - 4 }$

A) 2187
B) -3
C) $\frac { 1 } { 3 }$
D) - $\frac { 1 } { 3 }$