$$\text { Use the Second Derivative Test to find the relative extrema, if any, of the function } f ( x ) = x + \frac { 64 } { x } \text {. }$$

Multiple Choice

$$\text { Use the Second Derivative Test to find the relative extrema, if any, of the function } f ( x ) = x + \frac { 64 } { x } \text {. }$$ Select the correct answer.

A) None
B) Rel. max. $f ( 0 ) = 0$
C) Rel. $\max . f ( 8 ) = 16$ ,
rel. min. $f ( - 8 ) = - 16$
D) Rel. $\max . f ( - 8 ) = - 16$ ,
rel. min. $f ( 8 ) = 16$