subject to section 26(2), means any physical security measure to preserve the availability, integrity or confidentiality of a critical infrastructure, and includes, but is not limited to, physical security measures to protect—
| (a) | any part or component of a critical infrastructure; |
| (b) | any physical structure that partly consists of, incorporates or houses information infrastructure; or |
| (c) | personnel or other persons at or nearby a critical infrastructure; |