Decide whether integration by parts or substitution should be used to compute the indefinite integral 
If substitution, indicate the value of u; if by parts, indicate f(x) and g(x).
A. substitution; u = 4x
B. integration by parts; f(x) = ln 4x, g(x) =1
C. integration by parts; f(x) = ln x, g(x) = 4x
D. integration by parts; f(x) = 1, g(x) = ln 4x
E. none of these
Answer: B
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