Simplify the Following Expression $7 ^ { - 2 } \cdot 7 ^ { 3 } \cdot 7 ^ { - 4 }$

Multiple Choice

Simplify the following expression. Do not use parentheses or negative exponents. $7 ^ { - 2 } \cdot 7 ^ { 3 } \cdot 7 ^ { - 4 }$

A) -343
B) $7 ^ { 3 }$
C) $\frac { 1 } { 343 }$
D) $- \frac { 1 } { 343 }$
E) 343