Evaluate the Indicated Expression $\log _{7} \frac{1}{\sqrt{343}}$ A) 3/2
B) -3/2
C) 2/3
D) -2/3

Evaluate the indicated expression. $\log _{7} \frac{1}{\sqrt{343}}$

A) 3/2
B) -3/2
C) 2/3
D) -2/3