The component of the computer that stores data for the long term is the HDD (Hard Disk Drive).
- CPU (Central Processing Unit) is responsible for processing data and executing instructions.
- OS (Operating System) is software that manages hardware and software resources but doesn't store data itself.
- RAM (Random Access Memory) is used for short-term data storage and is volatile, meaning it loses its data when the power is turned off.
So, the correct answer is HDD.