There is a group of 5 people among which there is one couple. In how many ways can these 5 people be seated in a row

There is a group of 5 people among which there is one couple. In how many ways can these 5 people be seated in a row having 5 chairs if the couple is to be  seated next to each other?

1. 24
2. 48
3. 60
4. 120