Which of the following is an example of C2C marketing?

DRD Furnishing sources wood for its products from Timber Supplies Inc.

Persephone Fashions sells its designs both online and through retail stores.

Gillian advertises her bicycle on an online marketplace and sells it to a buyer from her city.

Ryerson Electronics sells its products directly to customers, eliminating wholesalers and retailers.

Sereni-Tea sells its herbal teas only through its website and has products delivered to customers who order them.