Write a Formula for the General Term, or Nth Term $a _ { n } = ( - 1 ) ^ { n } ( 4 ) ^ { n }$

Multiple Choice

Write a formula for the general term, or nth term, for the given sequence.
--4, 16, -64, 256, -1024, . . .

A) $a _ { n } = ( - 1 ) ^ { n } ( 4 ) ^ { n }$
B) $a _ { n } = ( - 1 ) ^ { n - 1 } ( 4 ) ^ { n }$
C) $a _ { n } = - 4 + 12 ( n - 1 )$
D) $a _ { n } = ( - 1 ) ^ { n } ( 4 n )$