What essential information must be included on each registration identification card for private investigators or security guards?

The correct choice emphasizes the importance of the date of issuance on the registration identification card for private investigators or security guards. Including the date of issuance is crucial for ensuring that the identification card is current and valid. This helps both the employer and the public to verify that the holder is authorized to perform their duties. It also allows for tracking and renewal processes, ensuring that individuals are not operating on outdated credentials, which could lead to compliance issues or legal repercussions.

While the holder's photograph is useful for identification purposes, it primarily serves to confirm the identity of the individual holding the card. The holder's address can provide additional personal information but is not as critical in validating the document’s effectiveness in demonstrating the individual's qualifications. An emergency contact number, while beneficial in certain situations, does not directly relate to the legitimacy or authority of the identification card itself. Therefore, the date of issuance stands out as a fundamental element in maintaining the integrity and accountability of the registration identification card.