Final answer:
ESF 15 - External Affairs is the primary ESF responsible for coordinating federal response and resources during emergencies, ensuring unified action and timely information dissemination.
Step-by-step explanation:
The Emergency Support Function (ESF) that primarily focuses on coordinating federal response and resources during emergencies is ESF 15 - External Affairs. This function is critical to managing communications and disseminating information during disasters to the public, stakeholders, and the media. Their role includes coordinating federal actions to support the operations of other ESFs, ensuring that the federal response is unified, and emergency information is provided to affected areas in a timely manner.