Find \( f'(4) \) given that \( f(x) = \/4 ⋅ h(x)\2x/h(x) \), \( h(4) = 3 \), \( h'(4) = 4 \).
a. \( -\/3\8 \)
b. \( -\/1\4 \)
c. \( \/1\2 \)
d. \( \/5\4 \)