4. Perform the set operation

If \(U\) \(=\) \(\{b\), \(d\), \(i\), \(k\), \(m\), \(r\), \(t\}\), \(A\) \(=\) \(\{b\), \(i\), \(t\}\) and \(B\) \(=\) \(\{d\), \(i\), \(k\}\) then find the following:

 

(i) \(A\) \(\cup\) \(B\) \(=\)

 

(ii) \((A\) \(\cup\) \(B)^{\prime}\) \(=\)