Simplify the Expression and Write the Answer Without Negative Exponents $x ^ { - 9 } \cdot x ^ { 5 }$

Multiple Choice

Simplify the expression and write the answer without negative exponents.
- $x ^ { - 9 } \cdot x ^ { 5 }$

A) $x ^ { 4 }$
B) $- \frac { 1 } { x ^ { 4 } }$
C) $\frac { 1 } { x ^ { 4 } }$
D) $- x ^ { 4 }$