Which of the following are members of the set of Gaussian integers Z[i]={a+bi∣a,b∈Z}\mathbb{Z}[i] = \{a + bi \mid a, b \in \mathbb{Z}\}Z[i]={a+bi∣a,b∈Z}?
3+2i3 + 2i3+2i
555
0.5+i0.5 + i0.5+i
−i-i−i