Multiply and Leave Your Answer in Exponent Form $\left( 9 ^ { 10 } \right) \left( 9 ^ { 20 } \right)$

Multiple Choice

Multiply and leave your answer in exponent form.
- $\left( 9 ^ { 10 } \right) \left( 9 ^ { 20 } \right)$

A) $81 ^ { 30 }$
B) $9 ^ { 10 }$
C) 9²⁰⁰
D) 9³⁰