A port scanner is the tool that would most likely help the analyst determine if the applications are running on a remote server. A port scanner is a software tool that scans a network device for open ports. Ports are logical endpoints for network communication that are associated with specific applications or services. By scanning the ports on a remote server, the analyst can identify what applications or services are running on that server and what protocols they are using. A port scanner can also help detect potential vulnerabilities or misconfigurations on a server.

A microSD card is the best method to stage the new media for the default boot device of a remote embedded IoT server that is having a Linux OS upgrade installed. A microSD card is a small and portable storage device that can store large amounts of data. It can be easily inserted into the slot of an embedded IoT server, which is a small and low-power device that performs specific tasks and connects to other devices over a network. A microSD card can also be formatted with different file systems, such as FAT32 or ext4, which are compatible with Linux OS. References: CompTIA Server+ Certification Exam Objectives, Domain 4.0: Networking, Objective 4.3: Given a scenario, configure servers for IoT applications.

A warm site is a type of disaster recovery site that has some pre-installed hardware, software, and network connections, but not as much as a hot site. A warm site also has some backup data, but not as current as a hot site. A warm site requires some time and effort to become fully operational in the event of a disaster. A hot site is a disaster recovery site that has all infrastructure and live data, and can take over the primary site's operations immediately. A cold site is a disaster recovery site that has no infrastructure or data, and requires significant time and resources to set up. References:
https://www.enterprisestorageforum.com/management/disaster-recovery-site/
https://www.techopedia.com/definition/3780/warm-site