b) Given that $U=\{x: x$ is an integer and $4 \leq x \leq 22\}, A=\{x: x$ is a multiple of 5$\}, B=\{x: x$ is a prime number $\}$ and $C=\{x: x$ is a factor of 30$ \}$, list the elements of i) $\mathrm{B} \cap \mathrm{C}$. ii) $(A \cup C)^{\prime} \cup B$. SP.JG.133