Find All Numbers for Which the Rational Expression Is Not $$\frac { \mathrm { d } - 7 } { 4 - \mathrm { d } }$$

Multiple Choice

Find all numbers for which the rational expression is not defined.
- $$\frac { \mathrm { d } - 7 } { 4 - \mathrm { d } }$$

A) d = 4
B) d = -4
C) d = 4, 7
D) None