Explanation:

All codes are correctly matched.

Different Collar Jobs

• Blue-Collar Worker: It is a member of the working class, who performs manual labour and earns an hourly wage.
• White-Collar Worker: It is a salaried professional, typically referring to general office workers and management.
• Gold-Collar Worker: It is used to refer to highly-skilled knowledge people who are highly valuable to the company. Example: Lawyers, doctors, research scientists, etc.
• Grey-Collar Worker: It refers to the balance of employed people not classified as white or blue-collar. Although grey-collar is something used to describe those who work beyond the age of retirement. Example: Firefighters, police officers, health care professionals, Security Guards, etc.
• Green-Collar Worker: It is a worker who is employed in the environmental sectors of the economy. Example: People working in alternative energy sources like solar panels, Greenpeace, World Wide Fund for nature, etc.
• Pink-Collar Worker: It is employed in a job that is traditionally considered to be women’s work and is often low-paid.
• Scarlet-Collar Worker: It is a term often used to refer to people who work in the pornography industry, especially women entrepreneurs in the field of internet pornography.
• Red-Collar Worker: Government workers of all types.
• Open-Collar Worker: It is a worker who works from home, especially via the internet.

Hence option 4th is correct.