If f is the function defined for all k by f(k) = ~$\frac{k^{5}}{16}$~ , what is f(2k) in terms of f(k)?

~$\frac{1}{8}$~f(k)

~$\frac{5}{8}$~f(k)

2 f(k)

10 f(k)

32 f(k)