$1.$Sway bars in vehicles are an example of:

A$)$ Helical compression springs

B$)$ Helical torsion springs

C$)$ Multi$-$leaf springs

D$)$ Non$-$circular wire helical springs

$2.$The main reason for using springs made of non$-$circular wire is to:

A$)$ Create a unique aesthetic appearance

B$)$ Achieve specific mechanical properties with reduced space

C$)$ Increase the spring's ability to conduct electricity

D$)$ Change the color of the spring under different lighting conditions