Which of the following describes the process of 'smoking' as a specialised food preparation technique?
a. A cooking process that involves adding smoked wood chips to the ingredients for the dish and extracting them prior to service
b. A cooking process that involves sealing and cooking the food item in a pan or wok on high heat, which creates smoke during the process
c. A cooking process that involves smoking wood to add subtle flavours to meat, browning and preserving the food
d. A cooking process that involves using charcoal as the heat source.