Which of the following characteristics MOST separates a tablet from a laptop?

Unlike laptops, which typically allow access to RAM, storage, and batteries via removable panels or standard screws, tablets are manufactured as sealed assemblies with components glued, soldered, or bonded together. This design prioritizes thinness and durability but means repairs and upgrades must be performed by authorized service centers, making 'non-field-serviceable' the defining differentiator from laptops.

Tablets do have internal storage (eMMC or NAND flash); the absence of a storage medium would make the device non-functional and is not a defining tablet characteristic.

Tablets include internal wireless radios (Wi-Fi and often cellular LTE/5G) as standard features, so they do not lack internal wireless.

Touchscreens are a defining feature of tablets, not something they lack; it is laptops that traditionally lack touchscreens (though many modern laptops now include them).