Simplify the Expression and Write the Answer Without Negative Exponents $x ^ { - 7 } \cdot x ^ { - 4 }$

Multiple Choice

Simplify the expression and write the answer without negative exponents.
- $x ^ { - 7 } \cdot x ^ { - 4 }$

A) $2 x ^ { - 11 }$
B) $x ^ { - 11 }$
C) $2 x ^ { - 28 }$
D) $x ^ { - 28 }$