Calculate the sum of the complex numbers z1=3+4iz_1 = 3 + 4iz1=3+4i and z2=1−2iz_2 = 1 - 2iz2=1−2i.
4+2i4 + 2i4+2i
2+6i2 + 6i2+6i
4+6i4 + 6i4+6i
2+2i2 + 2i2+2i