Which item is associated with a company's informal channel of communication?

The item associated with a company's informal channel of communication is the grapevine. The grapevine refers to the unofficial network through which information, both accurate and inaccurate, spreads among employees. It often involves informal conversations and sharing of news that occurs spontaneously among staff. This form of communication can play a significant role in an organization, as it reflects the social dynamics and culture within the workplace. It can help employees stay connected and informed about company happenings, even if information is not formally communicated through official channels.

In contrast, the other options represent formal channels of communication. The employee handbook typically contains official policies and procedures for employees, while the company newsletter is a structured way to disseminate information officially to staff. Official reports are also systematic documents that convey crucial information, often used for organizational planning and decision-making. These formal methods serve to ensure clarity, accuracy, and consistency in the information shared across the organization.