Answer:
The answer is: People variable
Step-by-step explanation:
In a traditional 4 Ps marketing mix (price, product, place & promotion), customer services is not dealt with appropriately. A more modern approach, called the 7 Ps of Service Marketing adds the process, people and physical evidence variables.
People variable refers to the task individuals perform to support the product. They include service providers, customer service, marketers, etc.
This more modern approach (proposed in 1981) is mostly used for selling services, but has gained importance with more modern and technical products.