Which of the following can lead to the discharge of a constable?

The discharge of a constable can occur due to engaging in fraud, as it represents a serious breach of trust and ethical standards required for law enforcement positions. Fraud undermines the integrity of the constable's role and violates laws intended to ensure honesty and accountability in public service. When a constable is found to be involved in fraudulent activities, it not only tarnishes their reputation but can also lead to legal consequences, ultimately resulting in their dismissal from the position.

Other scenarios, such as receiving complaints from the public or failing to attend training sessions, may warrant disciplinary action or corrective measures but do not inherently equate to grounds for discharge unless they are severe or recurrent issues. High performance ratings, on the other hand, reflect a constable's commitment to their duties and would not lead to their discharge. Thus, the involvement in fraud clearly represents the most serious violation that can directly result in the loss of a constable's position.