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 hybrid orbitals can accommodate a maximum of six electrons. iii. the orbitals resulting from sp3d2 hybridisation 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.