Final answer:
A fusible link or heat detector should be installed above each protected cooking appliance and above each fire exit to safely activate the suppression system and ensure clear evacuation paths during a fire.
Step-by-step explanation:
A fusible link or heat detector should be provided above each protected cooking appliance to ensure that in the event of a fire, the suppression system is activated. The correct answer to what else should have a fusible link or heat detector is D) Above each fire exit. While fusible links are most commonly located in areas with a high potential for fires, such as kitchens, placing them above fire exits is also a prudent safety measure. This helps ensure that the means of egress remains clear and safe for evacuation during a fire emergency.