Explanation:

- Personal misconduct generally includes inappropriate or unethical behavior by an individual, especially in a professional setting.

- Option 1: Bias – Exhibiting unfair favoritism or prejudice toward certain individuals or groups can indeed be considered misconduct.

- Option 2: Bribery – Offering or accepting something of value to influence actions is a classic example of misconduct.

- Option 3: Having interest in the subject-matter of reference – Holding a vested interest in a matter where objectivity is required can lead to misconduct.

- Option 4: All of the above – This option is correct as all listed behaviors can constitute personal misconduct under certain contexts.