What is the primary difference between stereoisomers and enantiomers?

Stereoisomers are always chiral, while enantiomers are always achiral.

Stereoisomers have different atomic compositions, while enantiomers have the same atomic composition.

Stereoisomers differ in their 3D spatial arrangement, while enantiomers are non-superimposable mirror images.

Stereoisomers can be converted into enantiomers by breaking and reforming bonds.