Explanation:

The correct answer is option 'A' - the watchman comes on duty when the child sleeps.

The watchman is a person responsible for the security and safety of a particular area, such as a building, neighborhood, or community. They are usually employed to keep a watchful eye on the surroundings and ensure that everything is in order during their shift. The watchman plays a crucial role in maintaining security, preventing unauthorized access, and reporting any suspicious activities or incidents.

Role of a Watchman:

The role of a watchman is to protect and safeguard the area they are assigned to. They are responsible for:

1. Security: The watchman ensures the security of the premises by patrolling the area, checking entrances and exits, and monitoring surveillance systems if available.

2. Access Control: They regulate access to the premises by verifying the identity of individuals entering or leaving. This helps prevent unauthorized entry and maintains the safety of the residents or occupants.

3. Emergency Response: In case of emergencies such as fires, accidents, or other incidents, the watchman is trained to respond quickly and take appropriate actions to mitigate the situation. They may also be responsible for directing emergency services to the location.

4. Reporting: The watchman keeps detailed records of their observations and any incidents that occur during their shift. This information is crucial for investigations, maintaining security logs, and identifying potential risks or vulnerabilities.

Timing of a Watchman:

The timing of a watchman's duty may vary depending on the specific requirements of the location they are assigned to. However, in the given question, it states that the watchman comes on duty when the child sleeps. This indicates that the watchman's shift starts when the child goes to bed.

This timing is logical as the watchman's presence is particularly important during nighttime when most people are asleep. Criminal activities are more likely to occur during the cover of darkness, making it essential for the watchman to be vigilant and ensure the safety of the premises.

By starting their duty when the child sleeps, the watchman can also provide additional security for the child and their family, ensuring a peaceful and safe environment for everyone.

To summarize, the watchman comes on duty when the child sleeps to provide security, regulate access, respond to emergencies, and maintain a safe environment for the residents or occupants.