Which of the following statements concern with d-block metals?

The majority of transition metal transition metal complex compounds are coloured due to d-d electron transition or charge transfer, whereas ionic compounds are coloured due to anion polarisation. Transition elements have high melting and boiling points due to strong metallic bonds between their atoms. Zinc has all of its electrons paired ) ([Ar] $3{\mathrm{d}}^{10} 4{\mathrm{s}}^2$  and thus does not participate in metallic bonding. Due to the presence of vacant d orbitals, it forms complexes.