Which of the following tools would an administrator use to test connectivity of a server in the cloud?

Ping sends Internet Control Message Protocol (ICMP) echo request packets to a target host and listens for ICMP echo reply packets, effectively verifying if the target is reachable and measuring round-trip time. This is a fundamental tool for checking basic network reachability to any IP-addressable device, including cloud servers.

FTP (File Transfer Protocol) is used for transferring files between hosts, not for testing general network connectivity.

Nslookup is a command-line tool used for querying Domain Name System (DNS) servers to obtain domain name or IP address mapping or other DNS records, not for direct network connectivity testing.

Netstat (network statistics) is a command-line tool that displays active network connections, routing tables, and a number of network interface statistics, but it does not actively test connectivity to a remote server.