Promotion mix refers to combination of promotional tools used by an organisation  to  acheive its communication objectives. Various tools of communication are used by the marketers to inform and persuade customers about their firm’s products. 

The concept that is not a part of the promotion mix is (4) Advertising Ethics.

The promotion mix typically includes the following elements:

Personal selling: This involves direct interaction between a salesperson and a potential customer to persuade them to make a purchase.

Publicity: Publicity is a form of non-personal communication that seeks to create a favorable image or reputation for a product, service, or organization through various media channels.

Public relations: Public relations involves managing the communication and relationships between an organization and its various publics, including customers, employees, shareholders, and the general public.

Advertising ethics, on the other hand, is a concept related to the moral and ethical considerations in advertising but is not typically considered one of the elements in the promotion mix.