Which of the following has to be ensured when repacking a CPU?

When repacking a CPU, it is crucial to ensure that it is protected using an ESD (Electrostatic Discharge) bag. This is important because CPUs are sensitive electronic components that can be damaged by static electricity. An ESD bag is designed to prevent electrostatic discharge, which can disrupt or destroy the delicate circuitry of the CPU. Therefore, using an ESD bag ensures that the CPU is safely stored and transported without the risk of damage from static electricity, making it an essential step in the repacking process.

While cleaning the CPU, applying thermal paste, and using appropriate packaging may have their own importance, the primary concern in this context revolves around protecting the CPU from potential static damage, which emphasizes the need for ESD protection.