Final answer:
Watching documentaries on career options is NOT considered a resource for building a network of professional contacts because it does not involve direct interaction or relationship-building with industry professionals.
Step-by-step explanation:
The question you're asking is about identifying which option is NOT a resource for career investigation that aids in building a network of professional contacts. Options include attending industry conferences, joining professional associations, volunteering in a relevant field, and watching documentaries on career options.
Networking is key in the job search process and activities like attending industry conferences, joining professional associations and volunteering provide multiple opportunities to meet and engage with professionals in the field. These activities often involve interacting with others who share a common professional interest and can lead to making direct connections in the industry. In contrast, while watching documentaries on career options can be informative and help with understanding different career paths, it does not facilitate direct relationship-building or networking. Therefore, watching documentaries is NOT a resource that helps build a network of professional contacts.