Which one of the following statements is correct?
- AHybrid orbitals do not form $\sigma$ bonds
- BLateral overlap of $p$-orbitals or $p$- and $d$-orbitals produces $\pi$-bonds
- CThe strength of bonds follows the order $\sigma_{p-p} < \sigma_{s-s} < \pi_{p-p}$
- D$s$-orbitals do not form $\sigma$ bonds
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