Which of the following would be used to communicate a high level description of a major change that involved significant cost and risk to the organization?

In ITIL, a change proposal is submitted to change management prior to chartering a major or significant change. It communicates the high-level nature of the change, expected costs, associated risks, and anticipated benefits, allowing decision-makers to authorize or reject the initiative before substantial resources are committed.

A change policy defines the governance rules and authority levels for change management as a whole, not the specifics of an individual proposed change.

A service request is a low-risk, pre-approved, routine request from a user such as a password reset or software install - not a vehicle for major change proposals.

A risk register is a repository that tracks identified risks and their status; it does not communicate a proposal for a specific change to decision-makers.