Given the sets $A=\{1,3,5\}, B=\{2,4,6\}$ and $C=\{0,2,4,6,8\},$ which of the following may be considered as universal set $(s)$ for all the three sets $A$, $B$ and $C$

$\{ 1,2,3,4,5,6,7,8\} $

List all the elements of the following sers :

$C = \{ x:x$ is an integer ${\rm{; }}{x^2} \le 4\} $

State whether each of the following set is finite or infinite :

The set of animals living on the earth

State which of the following sets are finite or infinite :

$\{ x:x \in N$ and $x$ is prime $\} $

Which of the following are examples of the null set

$\{ y:y$ is a point common to any two parallellines $\} $