What must all portable fire extinguishers have?

All portable fire extinguishers must have an up-to-date tag, the pin in place, and be inspected annually to ensure they are functioning properly and are ready for use in case of a fire emergency.

An up-to-date tag indicates that the fire extinguisher has been inspected, maintained, and is currently in compliance with safety regulations. This tag serves as a visual reminder of the extinguisher's status and confirms that it’s been checked for usability.

Having the pin in place is crucial for safety, as it prevents accidental discharge. The pin should remain intact until the extinguisher is needed, ensuring that it can be operated effectively without any premature activation.

Annual inspection is mandated to ensure that the extinguisher is regularly checked for any signs of wear, damage, or discharge. This provides assurance that it will function correctly during an emergency scenario.

Since all these elements are essential for the safety and effectiveness of portable fire extinguishers, the correct answer encompasses all those requirements—making "all of these" the appropriate response.