At What Points Is the Given Function Continuous?
- $$f ( x , y , z ) = \frac { e ^ { x } } { e ^ { y + z } }$$

Multiple Choice

At what points is the given function continuous?
- $$f ( x , y , z ) = \frac { e ^ { x } } { e ^ { y + z } }$$

A) All $( x , y , z )$ in the first octant
B) All $( x , y , z )$
C) All $( x , y , z )$ such that $x \geq 0$ and $y + z \geq 0$
D) All $( x , y , z )$ such that $x - y - z \geq 0$