Which of the following memory types is used exclusively in laptops?

DIMM (Dual Inline Memory Module) is the standard full-size memory form factor used exclusively in desktop and server motherboards, not laptops.

DDR3 is a memory generation standard that exists in both full-size DIMM and SODIMM form factors, so it is not exclusive to laptops.

RAMBUS (RDRAM) memory was a proprietary technology used in select desktop platforms and game consoles and was never a laptop-exclusive form factor.

SODIMM (Small Outline Dual Inline Memory Module) was designed exclusively for compact devices such as laptops, small form-factor desktops, and all-in-ones. Its reduced footprint - approximately 67.6 mm long versus 133.4 mm for a standard DIMM - means it physically cannot be installed in a standard desktop motherboard slot, confirming its exclusive use in portable systems.