Klebsiella pneumoniae enterobacter spp serratia marcescens

Which organisms from the Enterobacteriaceae family are known for their motility?

1: Klebsiella pneumoniae and Serratia marcescens
2: Serratia marcescens and Enterobacter spp.
3: Serratia marcescens only
4: None from the Enterobacteriaceae family show motility.