A waveform that is neither EVEN nor ODD but has half wave

A waveform that is neither EVEN nor ODD but has half wave symmetry can be expressed in terms of Fourier series expansion as sum of—

1. odd harmonics of both sine and cosine terms
2. even harmonics of both sine and cosine terms
3. odd harmonics of sine terms
4. even harmonics of cosine terms

Half-wave symmetry can be expressed is terms of Fourier series expansion as sum of odd harmonics of both sine and cosine terms.