Which response contains all the following statements that are true, and no others? (i) a set of sp2 orbitals can be thought of as one s orbital one-third of the time and two p orbitals two-thirds of the time. (ii) a set of sp orbitals can accommodate a maximum of six electrons. (iii) the orbitals resulting from sp3d2 hybridization are directed toward the corners of an octahedron. (iv) a set of sp3 orbitals results from the mixing of one s orbital and three p orbitals.