What is the type of contract with the lowest risk from a buyer's point of view?

Question

Haneef Mohammed · Answer

bind contractor for Lumpsum Amount with no variation & fixed the prices for the expected work to be done on remeasurable basis.

Hithem Sughi · Answer

Call off contract with fixed schedule of rates. No commitments and striking service continuty in the same time.

مستخدم محذوف‎ · Answer

credit sales contract with the right of return if not sales , or consignment contract .