Which franchise model legally obligates a franchisee to replicate all aspects of the franchisor's business?

Business format.

Explanation:

In business format franchise model, the franchisee is legally allowed to replicate all aspects of the franchisor's business. The legal agreement between the franchisor and franchisee is for a period of time.

In this type of arrangement, the right to sell the products for a fee, to trademark and also use the trade name is given to the franchisee by the the franchisor in return for a fee or comision. It is the most commonest type of franchise usually preferred by the franchisee.