At What Points Is the Given Function Continuous?
- $$f ( x , y , z ) = y z \cos \left( \frac { 1 } { x } \right)$$

Multiple Choice

At what points is the given function continuous?
- $$f ( x , y , z ) = y z \cos \left( \frac { 1 } { x } \right)$$

A) All $( x , y , z )$ such that $0 \leq \frac { 1 } { x } \leq 2 \pi$
B) All $( x , y , z )$ such that $x \neq 0$
C) All $( x , y , z )$
D) All $( x , y , z )$ such that $x \neq \frac { 2 } { \pi }$