Answer: Radiation
Explanation: Waves (electromagnetic waves) transfer heat by the process of radiation, where radiation means the emission or transmission of energy by waves or particles, and heat is a form of energy, so this has sense.
In the other hand, convection means the heat transfer done by the bulk movement of particles inside gases or liquids, for example, if you heat a pot with water inside, first the water near the bottom is heated, and then by convection, this heated water moves and gives heat to the surrounding water.