W Write The $n$ Th Term of the Geometric Sequence as a Function Of as a Function

Multiple Choice

W Write the $n$ th term of the geometric sequence as a function of $n$ .
$$a _ { 1 } = 4 , a _ { k + 1 } = 2 a _ { k }$$

A) $a _ { n } = 4 ( 2 ) ^ { n - 1 }$
B) $a _ { n } = 2 ( 4 ) ^ { n - 1 }$
C) $a _ { n } = 4 \left( \frac { 1 } { 2 } \right) ^ { n - 1 }$
D) $a _ { n } = 2 + 2 n$
E) $a _ { n } = 4 ( 2 ) ^ { n }$