Simplify the Expression $x ^ { 11 } \cdot x ^ { - 7 }$

Multiple Choice

Simplify the expression. Write the result without using negative exponents. (Assume all variables represent nonzero
real numbers.)
- $x ^ { 11 } \cdot x ^ { - 7 }$

A) 4
B) $x ^ { 4 }$
C) $x ^ { 18 }$
D) $\frac { x ^ { 11 } } { x ^ { 7 } }$