Which of the following is NOT one of the ways to activate CO2?

The correct answer identifies a method that is not typically utilized for activating CO2 systems. A manual pull station is commonly used in fire alarm systems to manually initiate an alarm or water-based suppression system; however, it is generally not a standard component for directly engaging carbon dioxide (CO2) suppression systems.

In contrast, a pressure switch, remote activation at designated locations like the port side FMMR entrance, and activation through a Management Control and Monitoring System (MCMS) are all valid methods for initiating CO2 suppression. These approaches allow for more controlled and automated responses to fire scenarios where CO2 might be needed. Understanding the specific activation methods is crucial in safety protocols, especially in environments where CO2 suppression is employed, highlighting the importance of each option's functionality in the activation process.