What Makes Group Therapy Different Than Individual and Family Therapy

What makes group therapy different than individual and family therapy?

A) individual therapy only involves one client, family therapy involves meeting with all family members individually
B) individual therapy does not take into account the family members, family therapy involves meeting with all family members
C) individual therapy involves one client at a time, family therapy only works with one family at a time
D) individual therapy does not take into account the family members, family therapy only works with one family at a time