A technician is replacing memory in a server whose motherboard supports PC100 or PC133 memory. This type of memory is also known as which of the following?

PC100 and PC133 refer to the bus speed (100 MHz and 133 MHz respectively) of single data rate Synchronous Dynamic Random-Access Memory (SDRAM). SDRAM was a predominant type of computer memory module in the late 1990s and early 2000s, preceding DDR (Double Data Rate) memory.

RAMBUS (RDRAM) was a competing memory technology that used a different architecture and was distinct from PC100/PC133 SDRAM.

DDR2 memory is a later generation of Double Data Rate SDRAM, which operates at much higher speeds and is incompatible with motherboards designed for PC100 or PC133 SDRAM.

DDR3 memory is an even newer generation of Double Data Rate SDRAM, offering further increased speeds and is not compatible with older motherboards supporting PC100/PC133.