Allowed. There are again two tree-level Feynman diagrams: -channel Z boson exchange and the crossed charged-current diagram with a W boson exchanged between the neutrino and electron lines.
The complete tree-level list for (ii), (iv), and (v) is:
/media/past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2019/iii/paper-305-standard-model-processes.png

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