There are more similarities than differences between bop and hard bop. Which of the following is NOT a difference between them?

Select one:

Hard bop exhibits a "laid back" approach with an emphasis on beats $2$ and $4$

Tone colors tend to be darker and weightier than those of bop

Drummers become more active

Hard bop tempos are even more hard$-$driving, often exceeding the blistering tempos of bop

Hard bop swings more than bop does