Which one of the following statement is correct?

Question

(a) Hybrid orbitals do not form $\sigma$ bonds

(b) Laternal overlap of p-orbitals or p- and d-orbitals produces $\pi$ bonds

(c) The strength of bonds follows the order:

$\sigma_{p-p} < \sigma_ {s -s} < \pi _{p-p}$

(d) s-orbitals do not form $\sigma$  bonds