State an Explicit Rule for the Nth Term of the Recursively-Defined

Multiple Choice

State an explicit rule for the nth term of the recursively-defined sequence.
- $$a _ { n } = 8 \cdot a _ { n - 1 } ; a _ { 1 } = 2$$

A) $a _ { n } = 2 \cdot 8 ^ { n - 1 }$
B) $a _ { n } = 2 \cdot 8 ^ { n }$
C) $a _ { n } = 8 \cdot 2 ^ { n }$
D) $a _ { n } = 8 \cdot 2 ^ { n - 1 }$