Which of the following are memory modules that contain self-checking parity?

SoDIMM refers to a small form factor of RAM modules, commonly used in laptops, and does not inherently include error-correcting capabilities.

ECC (Error-Correcting Code) memory incorporates extra bits and a controller to detect and correct single-bit memory errors automatically, a process that relies on a form of self-checking parity. This functionality is crucial for maintaining data reliability and system stability, particularly in server environments where data corruption can have significant consequences.

SDRAM is a type of RAM that synchronizes with the CPU's clock, but it does not intrinsically provide error correction.

DDR (Double Data Rate) describes a generation of SDRAM that processes data on both clock edges, and it is not a feature for error correction.