Solve for [tex]$x$[/tex], given the equation [tex]\sqrt{x-5}+7=11[/tex].
A. [tex]$x=21$[/tex], solution is extraneous
B. [tex][tex]$x=21$[/tex][/tex], solution is not extraneous
C. [tex]$x=81$[/tex], solution is extraneous
D. [tex]$x=81$[/tex], solution is not extraneous