Use Negative Exponents Where Necessary to Write the Expression with All

Use negative exponents where necessary to write the expression with all variables in the numerator of a term. That is,
write each term in the form c $c x ^ { n }$ if the term contains a variable.
- $$y = 6 x - 4 + \frac { 8 } { x ^ { 4 } } - \frac { 1 } { \sqrt { x } } + \frac { 1 } { \sqrt [ 3 ] { x ^ { 2 } } }$$

A) $y = 6 x - 4 + 8 x ^ { - 4 } - x ^ { - 2 } + 1 x ^ { - 3 / 2 }$
B) $y = 6 x - 12 + x ^ { - 4 } - x ^ { - 1 / 2 } + x ^ { - 2 / 3 }$
C) $y = 6 x - 4 + ( 8 x ) ^ { - 4 } - x ^ { - 1 / 2 } + ( 1 x ) ^ { - 2 / 3 }$
D) $y = 6 x - 4 + 8 x ^ { - 4 } - x ^ { - 1 / 2 } + 1 x ^ { - 2 / 3 }$