Where is the PLC program stored after being uploaded from a programming device?

The PLC program is stored in the load memory after being uploaded from a programming device. Load memory is specifically designed to hold the complete program and configuration data of the PLC. This type of memory retains the program even when power is lost, making it a crucial component for ensuring that the PLC can operate according to the uploaded program after a power cycle.

This is distinct from other memory types like operating memory, which is used for the execution of programs and temporary data processing. Backup memory serves as an additional safeguard for storing data and configurations but typically does not include the main operational program. Cache memory, on the other hand, is used for speeding up data access and is not intended for long-term storage of a PLC program. Thus, load memory is the most appropriate and correct answer for where the PLC program resides after being uploaded.