Which of the following represents the seventh root of [tex]$x^6$[/tex] in exponential form?

A. [tex]$x^{6/7}$[/tex]
B. [tex]$x^{7/6}$[/tex]
C. [tex]$x^{6 \cdot 7}$[/tex]
D. [tex]$x^{7 \cdot 6}$[/tex]