Find the Exact Value of the Logarithmic Expression Without Using $\log _ { 7 } \sqrt [ 3 ] { 7 }$

Multiple Choice

Find the exact value of the logarithmic expression without using a calculator.? $\log _ { 7 } \sqrt [ 3 ] { 7 }$ ?

A) 3
B) $\frac { 1 } { 3 }$
C) 7
D) ?21
E) None of these