Which of the following laptop hardware would be the LEAST likely to be replaced?

In the vast majority of modern laptops, the CPU is BGA (Ball Grid Array) soldered to the motherboard rather than socketed. Replacement requires specialized rework equipment and is not a standard field-serviceable operation, making it the component least likely to be replaced during normal maintenance or repair.

Laptop display screens, while labor-intensive to replace, are a standard repair performed by technicians and involve connectors that are designed to be disconnected and reconnected.

RAM in most laptops is accessible via a bottom panel or is installed in a removable SO-DIMM slot, making it one of the most commonly upgraded components.

Hard drives and SSDs are typically user-accessible via a dedicated access panel and are among the most frequently replaced laptop components for upgrades or failure recovery.