In all but the worst weather, Annika and three of her colleagues met each day at $12$:$15$ to walk the wilderness trail behind their office building. This is an example of a$($n$)$:

a$.$

Virtual team

b$.$

Informal group

c$.$

Self$-$managed team

d$.$

Continuous improvement team

e$.$

Formal group

f$.$

Employee resource group