Decide Whether Integration by Parts or Substitution Should Be Used $\int$

Multiple Choice

Decide whether integration by parts or substitution should be used to compute the indefinite integral $\int$ $\frac { \cos ( \ln x ) } { x }$ dx If substitution, indicate the value of u; if by parts, indicate f(x) and g(x) .

A) substitution; u = ln x
B) substitution; u = $\frac { \ln x } { x }$
C) integration by parts; f(x) = cos(ln x) , g(x) = $\frac { 1 } { x }$
D) integration by parts; f(x) = 1, g(x) = $\frac { \cos ( \ln x ) } { x }$
E) none of these