Find all numbers for which the rational expression is not defined.

$\frac{8c^2-17}{4c+29}$

Select the correct choice below and, if necessary, fill in the answer box to complete yo

A$.$ The rational expression is not defined for $c=($Simplify your answer. Use a comma to separate answers as needed.$)$

B$.$ The rational expression is not defined for all values of $c.$

C$.$ The rational expression is defined for all values of $c.$