What documentation is often required for a contractor to bid on public projects?

For a contractor to bid on public projects, providing proof of insurance, experience, and project references is essential. This documentation demonstrates the contractor's capability to handle the responsibilities associated with the project safely and effectively.

Proof of insurance is necessary to ensure that the contractor has liability coverage in case of accidents or damages that may occur during the project. It protects both the contractor and the public from potential financial losses. Experience is vital because it indicates the contractor's familiarity with similar projects and their ability to deliver quality results. Project references serve as verification from past clients about the contractor's performance, reliability, and professionalism, which helps in building trust with the project owners or government entities.

Other options like business licenses may be relevant, but they alone do not encompass the breadth of qualifications needed for public project bidding. Similarly, employee attendance records and a site plan showing equipment are typically not mandatory for the bidding process, focusing instead on a contractor’s proven history and capability to manage larger undertakings effectively. Therefore, the correct answer aligns with the comprehensive qualifications required in the public contracting arena.