Which of the following is a method through which remoting services communicate?

Remote Method Invocation (RMI) is the correct method through which remoting services communicate because it allows an object to invoke methods on an object located in another Java Virtual Machine (JVM). In a remoting context, RMI facilitates the execution of methods across a network, enabling seamless interaction between distributed systems. This technology is designed for Java applications and provides a robust framework for remote communication, handling the underlying complexity of network operations.

The other methods mentioned are not appropriate for remoting services. File Transfer Protocol (FTP) is primarily used for transferring files over a network rather than executing methods remotely. A direct database connection typically allows applications to interact with a database server for data queries and transactions but does not facilitate method invocation across distributed systems. Local procedure calls refer to executing functions or procedures within the same application or process space, which do not extend to remote communications. Thus, RMI stands out as the suitable choice for facilitating remote service communication effectively.