Final answer:
A visitor log or sign-in log is a book used to record the details of individuals who visit a property or building for security and record-keeping purposes.
Step-by-step explanation:
The correct answer is A) a visitor log or sign-in log.
A visitor log or sign-in log is a book used to record the details of individuals who visit a particular property, building, or area of a building. It is a common practice in many establishments to have visitors sign in for security and record-keeping purposes. This log typically includes information such as the visitor's name, contact details, purpose of visit, and the date and time of entry.
For example, in an office building where multiple companies are housed, the receptionist may ask visitors to sign in at the front desk and provide relevant information. This helps the building management keep track of who is in the building at any given time and assists with security protocols if needed.