Which process involves having a system replicate the functionality of another system?

The correct answer is emulation, which refers to the process where one system replicates the functionality of another system. This is achieved by creating a software or hardware environment that mimics the behavior and capabilities of the original system. Emulation is commonly used for running applications or operating systems that are specific to a certain type of hardware or platform on different systems, thereby allowing programs to execute as if they were on the original hardware.

In contrast, replication generally refers to processes where data is duplicated across multiple locations to ensure redundancy or high availability, rather than mimicking system functionality. Simulation, on the other hand, involves creating a model of a system to study its behavior under various conditions, but it does not replicate the exact functionality or performance of the original system. Virtualization involves creating virtual instances of hardware or software environments on a single physical machine, allowing multiple operating systems to run simultaneously but does not inherently replicate functionality between disparate systems in the same way that emulation does.