At What Points Is the Given Function Continuous?
- $$f ( x , y , z ) = \frac { z } { x ^ { 2 } + y ^ { 2 } - 5 }$$

Multiple Choice

At what points is the given function continuous?
- $$f ( x , y , z ) = \frac { z } { x ^ { 2 } + y ^ { 2 } - 5 }$$

A) All $( x , y , z )$ such that $x ^ { 2 } + y ^ { 2 } \neq 0$
B) All $( x , y , z )$ such that $x ^ { 2 } + y ^ { 2 } \neq 5$
C) All $( x , y , z )$
D) All $( x , y , z )$ such that $x ^ { 2 } + y ^ { 2 } \neq 25$