Stephanie, DeMarcus, and Luna run a woodworking store on Etsy that they run out of their shared apartment. They do not have a brick$-$and$-$mortar store, nor do they offer pickup or delivery services. Instead, they ship their goods to customers anywhere in the world. The three of them are engaging in:

a$.$

Collaborative computing

b$.$

Lean management

c$.$

E$-$Commerce

d$.$

Mercantilism

e$.$

Joint venture

f$.$

Telecommuting